Exhibit 10.69

                                                               EXECUTION VERSION

================================================================================

                         L-3 COMMUNICATIONS CORPORATION,
                                    As Issuer

                    6 3/8% SENIOR SUBORDINATED NOTES DUE 2015

                                   ----------

                                    INDENTURE

                            Dated as of July 29, 2005

                                   ----------

                                   ----------

                              The Bank of New York,
                                   As Trustee

                                   ----------

===============================================================================



                                TABLE OF CONTENTS

ARTICLE 1. DEFINITIONS AND INCORPORATION BY REFERENCE......................    1

   SECTION 1.01    DEFINITIONS.............................................    1
   SECTION 1.02    OTHER DEFINITIONS.......................................   18
   SECTION 1.03    INCORPORATION BY REFERENCE OF TRUST INDENTURE ACT.......   19
   SECTION 1.04    RULES OF CONSTRUCTION...................................   19

ARTICLE 2. THE NOTES.......................................................   20

   SECTION 2.01    FORM AND DATING.........................................   20
   SECTION 2.02    EXECUTION AND AUTHENTICATION............................   20
   SECTION 2.03    REGISTRAR AND PAYING AGENT..............................   21
   SECTION 2.04    PAYING AGENT TO HOLD MONEY IN TRUST.....................   21
   SECTION 2.05    HOLDER LISTS............................................   22
   SECTION 2.06    TRANSFER AND EXCHANGE...................................   22
   SECTION 2.07    REPLACEMENT NOTES.......................................   35
   SECTION 2.08    OUTSTANDING NOTES.......................................   35
   SECTION 2.09    TREASURY NOTES..........................................   35
   SECTION 2.10    TEMPORARY NOTES.........................................   36
   SECTION 2.11    CANCELLATION............................................   36
   SECTION 2.12    DEFAULTED INTEREST......................................   36
   SECTION 2.13    CUSIP NUMBERS...........................................   36

ARTICLE 3. REDEMPTION AND PREPAYMENT.......................................   37

   SECTION 3.01    NOTICES TO TRUSTEE......................................   37
   SECTION 3.02    SELECTION OF NOTES TO BE REDEEMED.......................   37
   SECTION 3.03    NOTICE OF REDEMPTION....................................   37
   SECTION 3.04    EFFECT OF NOTICE OF REDEMPTION..........................   38
   SECTION 3.05    DEPOSIT OF REDEMPTION PRICE.............................   38
   SECTION 3.06    NOTES REDEEMED IN PART..................................   39
   SECTION 3.07    OPTIONAL REDEMPTION.....................................   39
   SECTION 3.08    MANDATORY REDEMPTION....................................   39
   SECTION 3.09    OFFER TO PURCHASE BY APPLICATION OF EXCESS PROCEEDS.....   40

ARTICLE 4. COVENANTS.......................................................   41

   SECTION 4.01    PAYMENT OF NOTES........................................   41
   SECTION 4.02    MAINTENANCE OF OFFICE OR AGENCY.........................   42
   SECTION 4.03    REPORTS.................................................   42
   SECTION 4.04    COMPLIANCE CERTIFICATE..................................   43
   SECTION 4.05    TAXES...................................................   44
   SECTION 4.06    STAY, EXTENSION AND USURY LAWS..........................   44
   SECTION 4.07    RESTRICTED PAYMENTS.....................................   44
   SECTION 4.08    DIVIDEND AND OTHER PAYMENT RESTRICTIONS AFFECTING
                      RESTRICTED SUBSIDIARIES..............................   46
   SECTION 4.09    INCURRENCE OF INDEBTEDNESS AND ISSUANCE OF PREFERRED
                      STOCK................................................   48
   SECTION 4.10    ASSET SALES.............................................   51
   SECTION 4.11    TRANSACTIONS WITH AFFILIATES............................   52
   SECTION 4.12    LIENS...................................................   52
   SECTION 4.13    FUTURE SUBSIDIARY GUARANTEES............................   53


                                        i



   SECTION 4.14    CORPORATE EXISTENCE.....................................   54
   SECTION 4.15    OFFER TO REPURCHASE UPON CHANGE OF CONTROL..............   54
   SECTION 4.16    ANTI-LAYERING; SUBORDINATION OF SUBSIDIARY GUARANTEES...   55
   SECTION 4.17    PAYMENTS FOR CONSENT....................................   55
   SECTION 4.18    CHANGES IN COVENANTS WHEN NOTES RATED INVESTMENT
                      GRADE................................................   56

ARTICLE 5. SUCCESSORS......................................................   56

   SECTION 5.01    MERGER, CONSOLIDATION, OR SALE OF ASSETS................   56
   SECTION 5.02    SUCCESSOR CORPORATION SUBSTITUTED.......................   57
   SECTION 5.03    DELIVERY OF OFFICERS' CERTIFICATE AND OPINION OF
                      COUNSEL..............................................   57

ARTICLE 6. DEFAULTS AND REMEDIES...........................................   57

   SECTION 6.01    EVENTS OF DEFAULT.......................................   57
   SECTION 6.02    ACCELERATION............................................   59
   SECTION 6.03    OTHER REMEDIES..........................................   59
   SECTION 6.04    WAIVER OF PAST DEFAULTS.................................   60
   SECTION 6.05    CONTROL BY MAJORITY.....................................   60
   SECTION 6.06    LIMITATION ON SUITS.....................................   60
   SECTION 6.07    RIGHTS OF HOLDERS OF NOTES TO RECEIVE PAYMENT...........   61
   SECTION 6.08    COLLECTION SUIT BY TRUSTEE..............................   61
   SECTION 6.09    TRUSTEE MAY FILE PROOFS OF CLAIM........................   61
   SECTION 6.10    PRIORITIES..............................................   61
   SECTION 6.11    UNDERTAKING FOR COSTS...................................   62

ARTICLE 7. TRUSTEE.........................................................   62

   SECTION 7.01    DUTIES OF TRUSTEE.......................................   62
   SECTION 7.02    RIGHTS OF TRUSTEE.......................................   63
   SECTION 7.03    INDIVIDUAL RIGHTS OF TRUSTEE............................   65
   SECTION 7.04    TRUSTEE'S DISCLAIMERS...................................   65
   SECTION 7.05    NOTICE OF DEFAULTS......................................   65
   SECTION 7.06    REPORTS BY TRUSTEE TO HOLDERS OF THE NOTES..............   65
   SECTION 7.07    COMPENSATION AND INDEMNITY..............................   65
   SECTION 7.08    REPLACEMENT OF TRUSTEE..................................   66
   SECTION 7.09    SUCCESSOR TRUSTEE BY MERGER, ETC........................   67
   SECTION 7.10    ELIGIBILITY; DISQUALIFICATION...........................   67
   SECTION 7.11    PREFERENTIAL COLLECTION OF CLAIMS AGAINST COMPANY.......   68

ARTICLE 8. LEGAL DEFEASANCE AND COVENANT DEFEASANCE........................   68

   SECTION 8.01    OPTION TO EFFECT LEGAL DEFEASANCE OR COVENANT
                      DEFEASANCE...........................................   68
   SECTION 8.02    LEGAL DEFEASANCE AND DISCHARGE..........................   68
   SECTION 8.03    COVENANT DEFEASANCE.....................................   68
   SECTION 8.04    CONDITIONS TO LEGAL OR COVENANT DEFEASANCE..............   69
   SECTION 8.05    DEPOSITED MONEY AND GOVERNMENT SECURITIES TO BE HELD
                      IN TRUST; OTHER MISCELLANEOUS PROVISIONS.............   70
   SECTION 8.06    REPAYMENT TO COMPANY....................................   71
   SECTION 8.07    REINSTATEMENT...........................................   71

ARTICLE 9. AMENDMENT, SUPPLEMENT AND WAIVER................................   71

   SECTION  9.01   WITHOUT CONSENT OF HOLDERS OF NOTES.....................   71


                                       ii



   SECTION 9.02    WITH CONSENT OF HOLDERS OF NOTES........................   72
   SECTION 9.03    COMPLIANCE WITH TRUST INDENTURE ACT.....................   74
   SECTION 9.04    REVOCATION AND EFFECT OF CONSENTS.......................   74
   SECTION 9.05    NOTATION ON OR EXCHANGE OF NOTES........................   74
   SECTION 9.06    TRUSTEE TO SIGN AMENDMENTS, ETC.........................   74

ARTICLE 10. SUBSIDIARY GUARANTEES..........................................   75

   SECTION 10.01   AGREEMENT TO GUARANTEE..................................   75
   SECTION 10.02   EXECUTION AND DELIVERY OF SUBSIDIARY GUARANTEES.........   75
   SECTION 10.03   GUARANTORS MAY CONSOLIDATE, ETC. ON CERTAIN TERMS.......   76
   SECTION 10.04   RELEASES................................................   77
   SECTION 10.05   NO RECOURSE AGAINST OTHERS..............................   78
   SECTION 10.06   SUBORDINATION OF SUBSIDIARY GUARANTEES..................   78

ARTICLE 11. SUBORDINATION..................................................   79

   SECTION 11.01   AGREEMENT TO SUBORDINATE................................   79
   SECTION 11.02   LIQUIDATION; DISSOLUTION; BANKRUPTCY....................   79
   SECTION 11.03   DEFAULT ON DESIGNATED SENIOR DEBT.......................   79
   SECTION 11.04   ACCELERATION OF SECURITIES..............................   80
   SECTION 11.05   WHEN DISTRIBUTION MUST BE PAID OVER.....................   80
   SECTION 11.06   NOTICE BY COMPANY.......................................   81
   SECTION 11.07   SUBROGATION.............................................   81
   SECTION 11.08   RELATIVE RIGHTS.........................................   81
   SECTION 11.09   SUBORDINATION MAY NOT BE IMPAIRED BY COMPANY............   82
   SECTION 11.10   DISTRIBUTION OR NOTICE TO REPRESENTATIVE................   82
   SECTION 11.11   RIGHTS OF TRUSTEE AND PAYING AGENT......................   82
   SECTION 11.12   AUTHORIZATION TO EFFECT SUBORDINATION...................   82
   SECTION 11.13   AMENDMENTS..............................................   83

ARTICLE 12. MISCELLANEOUS..................................................   83

   SECTION 12.01   TRUST INDENTURE ACT CONTROLS............................   83
   SECTION 12.02   NOTICES.................................................   83
   SECTION 12.03   COMMUNICATIONS BY HOLDERS OF NOTES WITH OTHER HOLDERS
                      OF NOTES.............................................   84
   SECTION 12.04   CERTIFICATE AND OPINION AS TO CONDITIONS PRECEDENT......   84
   SECTION 12.05   STATEMENTS REQUIRED IN CERTIFICATE OR OPINION...........   84
   SECTION 12.06   RULE BY TRUSTEE AND AGENTS..............................   85
   SECTION 12.07   NO PERSONAL LIABILITY OF DIRECTORS, OFFICERS,
                      EMPLOYEES AND STOCKHOLDERS...........................   85
   SECTION 12.08   GOVERNING LAW...........................................   85
   SECTION 12.09   NO ADVERSE INTERPRETATION OF OTHER AGREEMENTS...........   85
   SECTION 12.10   SUCCESSORS..............................................   85
   SECTION 12.11   SEVERABILITY............................................   86
   SECTION 12.12   COUNTERPART ORIGINALS...................................   86
   SECTION 12.13   TABLE OF CONTENTS, HEADINGS, ETC........................   86


                                       iii



                                    EXHIBITS

EXHIBIT A   FORM OF NOTE

EXHIBIT B   FORM OF CERTIFICATE OF TRANSFER

EXHIBIT C   FORM OF CERTIFICATE OF EXCHANGE

EXHIBIT D   FORM OF CERTIFICATE FROM ACQUIRING INSTITUTIONAL ACCREDITED
            INVESTORS

EXHIBIT E   FORM OF SUPPLEMENTAL INDENTURE

EXHIBIT F   FORM OF NOTATION ON SENIOR SUBORDINATED NOTE RELATING TO SUBSIDIARY
            GUARANTEE


                                       iv



                             Cross-Reference Table*

Trust Indenture Act Section                                   Indenture Section
                                                             -------------------
310 (a)(1)................................................          7.10
    (a)(2)................................................          7.10
    (a)(3)................................................          N.A.
    (a)(4)................................................          N.A.
    (a)(5)................................................          7.10
    (b)...................................................          7.10
    (c)...................................................          N.A.
311 (a)...................................................          7.11
    (b)...................................................          7.11
    (c)...................................................          N.A.
312 (a)...................................................          2.05
    (b)...................................................          12.03
    (c)...................................................          12.03
313 (a)...................................................          7.06
    (b)(1)................................................          11.03
    (b)(2)................................................          7.07
    (c)...................................................       7.06;12.02
    (d)...................................................          7.06
314 (a)...................................................       4.03;12.02
    (b)...................................................          11.02
    (c)(1)................................................          12.04
    (c)(2)................................................          12.04
    (c)(3)................................................          N.A.
    (d)...................................................   11.03, 11.04, 11.05
    (e)...................................................          12.05
    (f)...................................................          N.A.
315 (a)...................................................          7.01
    (b)...................................................       7.05, 12.02
    (c)...................................................          7.01
    (d)...................................................          7.01
    (e)...................................................          6.11
316 (a)(last sentence)....................................          2.09
    (a)(1)(A).............................................          6.05
    (a)(1)(B).............................................          6.04
    (a)(2)................................................          N.A.
    (b)...................................................          6.07
    (c)...................................................          2.12
317 (a)(1)................................................          6.08
    (a)(2)................................................          6.09
    (b)...................................................          2.04
318 (a)...................................................          12.01
    (b)...................................................          N.A.
    (c)...................................................          12.01

N.A. means not applicable.

----------
*    This Cross-Reference Table is not part of the Indenture.


                                        V



          This INDENTURE, dated as of July 29, 2005, among L-3 Communications
Corporation, a Delaware corporation, (the "Company"), the guarantors listed on
the signature page hereto ( the "Guarantors"), and The Bank of New York, as
trustee (the "Trustee").

          The Company and the Trustee agree as follows for the benefit of each
other and for the equal and ratable benefit of the Holders of the 6 3/8% Senior
Subordinated Notes due 2015 (the "Series A Notes") and the 6 3/8% Senior
Subordinated Notes due 2015 (the "Exchange Notes" and, together with the Series
A Notes, the "Notes"):

                                   ARTICLE 1.
                          DEFINITIONS AND INCORPORATION
                                  BY REFERENCE

Section 1.01 Definitions.

          "144A Global Note" means the global note in the form of Exhibit A
hereto bearing the Global Note Legend and the Private Placement Legend and
deposited with and registered in the name of the Depositary or its nominee that
will be issued in a denomination equal to the outstanding principal amount of
the Notes sold in reliance on Rule 144A.

          "2002 Indenture" means the indenture, dated as of June 28, 2002, among
The Bank of New York, as trustee, the Company and the guarantors party thereto,
with respect to the 2002 Notes.

          "2002 Notes" means the $750,000,000 in aggregate principal amount of
the Company's 7-5/8% Senior Subordinated Notes due 2012, issued pursuant to the
2002 Indenture on June 28, 2002.

          "Acquired Debt" means, with respect to any specified Person, (i)
Indebtedness of any other Person existing at the time such other Person is
merged with or into or became a Restricted Subsidiary of such specified Person,
including, without limitation, Indebtedness incurred in connection with, or in
contemplation of, such other Person merging with or into or becoming a
Restricted Subsidiary of such specified Person, and (ii) Indebtedness secured by
a Lien encumbering any asset acquired by such specified Person.

          "Additional Interest" means all additional interest then owing
pursuant to Section 5 of the Registration Rights Agreement.

          "Additional Notes" means any Notes (other than the Initial Notes)
issued under this Indenture in accordance with Sections 2.02 and 4.09 hereof.

          "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person. For purposes of this definition, "control"
(including, with correlative meanings, the terms "controlling", "controlled by"
and "under common control with"), as used with respect to any Person, shall mean
the possession, directly or indirectly, of the power to direct or cause the
direction of the management or policies of such Person, whether through the
ownership of voting



securities, by agreement or otherwise; provided that beneficial ownership of 10%
or more of the voting securities of a Person shall be deemed to be control.

          "Agent" means any Registrar, Paying Agent or co-registrar.

          "Applicable Procedures" means, with respect to any transfer or
exchange of or for beneficial interests in any Global Note, the rules and
procedures of the Depositary, Euroclear and Clearstream that apply to such
transfer or exchange.

          "Asset Sale" means (i) the sale, lease, conveyance or other
disposition of any assets or rights (including, without limitation, by way of a
sale and leaseback) other than sales of inventory in the ordinary course of
business (provided that the sale, lease, conveyance or other disposition of all
or substantially all of the assets of the Company and its Restricted
Subsidiaries taken as a whole shall be governed by the covenant contained in
Section 4.15 and/or the covenant contained in Section 5.01 and not by the
covenant contained in Section 4.10), and (ii) the issue or sale by the Company
or any of its Subsidiaries of Equity Interests of any of the Company's
Restricted Subsidiaries, in the case of either clause (i) or (ii), whether in a
single transaction or a series of related transactions (A) that have a fair
market value in excess of $20.0 million or (B) for net proceeds in excess of
$20.0 million. Notwithstanding the foregoing: (i) a transfer of assets by the
Company to a Restricted Subsidiary or by a Restricted Subsidiary to the Company
or to another Restricted Subsidiary, (ii) an issuance of Equity Interests by a
Restricted Subsidiary to the Company or to another Restricted Subsidiary, (iii)
a Restricted Payment that is permitted by the covenant contained in Section 4.07
and (iv) a disposition of Cash Equivalents in the ordinary course of business
shall not be deemed to be an Asset Sale.

          "Attributable Debt" in respect of a sale and leaseback transaction
means, at the time of determination, the present value (discounted at the rate
of interest implicit in such transaction, determined in accordance with GAAP) of
the obligation of the lessee for net rental payments during the remaining term
of the lease included in such sale and leaseback transaction (including any
period for which such lease has been extended or may, at the option of the
lessor, be extended).

          "Bankruptcy Law" means Title 11, U.S. Code or any similar federal or
state law for the relief of debtors.

          "Board of Directors" means the Board of Directors of the Company, or
any authorized committee of the Board of Directors.

          "Broker-Dealer" has the meaning set forth in the Registration Rights
Agreement.

          "Business Day" means any day other than a Legal Holiday.

          "Capital Lease Obligation" means, at the time any determination
thereof is to be made, the amount of the liability in respect of a capital lease
that would at such time be required to be capitalized on a balance sheet in
accordance with GAAP.

          "Capital Stock" means (i) in the case of a corporation, corporate
stock, (ii) in the case of an association or business entity, any and all
shares, interests, participations, rights or


                                        2



other equivalents (however designated) of corporate stock, (iii) in the case of
a partnership or limited liability company, partnership or membership interests
(whether general or limited) and (iv) any other interest or participation that
confers on a Person the right to receive a share of the profits and losses of,
or distributions of assets of, the issuing Person.

          "Cash Equivalents" means (i) United States dollars, (ii) securities
issued or directly and fully guaranteed or insured by the United States
government or any agency or instrumentality thereof having maturities of not
more than one year from the date of acquisition, (iii) certificates of deposit
and eurodollar time deposits with maturities of six months or less from the date
of acquisition, bankers' acceptances with maturities not exceeding six months
and overnight bank deposits, in each case with any domestic financial
institution to the Senior Credit Facility or with any domestic commercial bank
having capital and surplus in excess of $500.0 million and a Thompson Bank Watch
Rating of "B" or better, (iv) repurchase obligations with a term of not more
than seven days for underlying securities of the types described in clauses (ii)
and (iii) above entered into with any financial institution meeting the
qualifications specified in clause (iii) above, (v) commercial paper having the
highest rating obtainable from Moody's or S&P and in each case maturing within
six months after the date of acquisition, (vi) investment funds investing 95% of
their assets in securities of the types described in clauses (i)-(v) above, and
(vii) readily marketable direct obligations issued by any State of the United
States of America or any political subdivision thereof having maturities of not
more than one year from the date of acquisition and having one of the two
highest rating categories obtainable from either Moody's or S&P.

          "Change of Control" means the occurrence of any of the following: (i)
the sale, lease, transfer, conveyance or other disposition (other than by way of
merger or consolidation), in one or a series of related transactions, of all or
substantially all of the assets of the Company and its Restricted Subsidiaries
taken as a whole to any "person" (as such term is used in Section 13(d)(3) of
the Exchange Act) other than the Principals or their Related Parties (as defined
below), (ii) the adoption of a plan relating to the liquidation or dissolution
of the Company, (iii) the consummation of any transaction (including, without
limitation, any merger or consolidation) the result of which is that any
"person" (as defined above), other than the Principals and their Related
Parties, becomes the "beneficial owner" (as such term is defined in Rule 13d-3
and Rule 13d-5 under the Exchange Act), directly or indirectly, of more than 50%
of the Voting Stock of the Company (measured by voting power rather than number
of shares) or (iv) the first day on which a majority of the members of the Board
of Directors of the Company are not Continuing Directors.

          "Clearstream" means Clearstream Banking, societe anonyme (formerly
Cedelbank).

          "Consolidated Cash Flow" means, with respect to any Person for any
period, the Consolidated Net Income of such Person for such period plus (i) an
amount equal to any extraordinary loss plus any net loss realized in connection
with an Asset Sale (to the extent such losses were deducted in computing such
Consolidated Net Income), plus (ii) provision for taxes based on income or
profits of such Person and its Restricted Subsidiaries for such period, to the
extent that such provision for taxes was included in computing such Consolidated
Net Income, plus (iii) consolidated interest expense of such Person and its
Restricted Subsidiaries for such


                                        3



period, whether paid or accrued and whether or not capitalized (including,
without limitation, original issue discount, non-cash interest payments, the
interest component of any deferred payment obligations, the interest component
of all payments associated with Capital Lease Obligations, imputed interest with
respect to Attributable Debt, commissions, discounts and other fees and charges
incurred in respect of letter of credit or bankers' acceptance financings, and
net payments (if any) pursuant to Hedging Obligations), to the extent that any
such expense was deducted in computing such Consolidated Net Income, plus (iv)
depreciation, amortization (including amortization of goodwill, debt issuance
costs and other intangibles but excluding amortization of other prepaid cash
expenses that were paid in a prior period) and other non-cash expenses
(excluding any such non-cash expense to the extent that it represents an accrual
of or reserve for cash expenses in any future period or amortization of a
prepaid cash expense that was paid in a prior period) of such Person and its
Restricted Subsidiaries for such period to the extent that such depreciation,
amortization and other non-cash expenses were deducted in computing such
Consolidated Net Income, minus (v) non-cash items (excluding any items that were
accrued in the ordinary course of business) increasing such Consolidated Net
Income for such period, in each case, on a consolidated basis and determined in
accordance with GAAP.

          "Consolidated Net Income" means, with respect to any Person for any
period, the aggregate of the Net Income of such Person and its Restricted
Subsidiaries for such period, on a consolidated basis, determined in accordance
with GAAP; provided that (i) the Net Income of any Person that is not a
Restricted Subsidiary or that is accounted for by the equity method of
accounting shall be included only to the extent of the amount of dividends or
distributions paid in cash to the referent Person or a Restricted Subsidiary
thereof, (ii) the Net Income of any Restricted Subsidiary shall be excluded to
the extent that the declaration or payment of dividends or similar distributions
by that Restricted Subsidiary of that Net Income is not at the date of
determination permitted without any prior governmental approval (that has not
been obtained) or, directly or indirectly, by operation of the terms of its
charter or any agreement, instrument, judgment, decree, order, statute, rule or
governmental regulation applicable to that Restricted Subsidiary or its
stockholders, (iii) the Net Income of any Person acquired in a pooling of
interests transaction for any period prior to the date of such acquisition shall
be excluded, (iv) the cumulative effect of a change in accounting principles
shall be excluded, (v) the Net Income of any Unrestricted Subsidiary shall be
excluded, whether or not distributed to the Company or one of its Restricted
Subsidiaries, and (vi) the Net Income of any Restricted Subsidiary shall be
calculated after deducting preferred stock dividends payable by such Restricted
Subsidiary to Persons other than the Company and its other Restricted
Subsidiaries.

          "Consolidated Tangible Assets" means, with respect to any Person, the
total consolidated assets of such Person and its Restricted Subsidiaries, less
the total intangible assets of such Person and its Restricted Subsidiaries, as
shown on the most recent internal consolidated balance sheet of such Person and
such Restricted Subsidiaries calculated on a consolidated basis in accordance
with GAAP.

          "Continuing Directors" means, as of any date of determination, any
member of the Board of Directors of the Company who (i) was a member of such
Board of Directors on the date of this Indenture or (ii) was nominated for
election or elected to such Board of Directors with the approval of a majority
of the Continuing Directors who were members of such Board at the time of such
nomination or election.


                                        4



          "Convertible Notes Indenture" means the indenture to be entered into
with respect to the Convertible Notes among The Bank of New York, as trustee,
Holdings, the Company, as a guarantor, and the other guarantors named therein.

          "Convertible Notes" means the $500,000,000 in aggregate principal
amount of Holdings' Convertible Contingent Debt Securities due 2035 to be issued
pursuant to the Convertible Notes Indenture in connection with the Titan
acquisition.

          "Corporate Trust Office of the Trustee" shall be at the address of the
Trustee specified in Section 12.02 hereof or such other address as to which the
Trustee may give notice to the Company.

          "Credit Facilities" means, with respect to the Company, one or more
debt facilities (including, without limitation, the Senior Credit Facility) or
commercial paper facilities with banks or other institutional lenders providing
for revolving credit loans, term loans, receivables financing (including through
the sale of receivables to such lenders or to special purpose entities formed to
borrow from such lenders against such receivables) or letters of credit, in each
case, as amended, restated, modified, renewed, refunded, replaced or refinanced
in whole or in part from time to time (and whether or not with the original
lender or lenders and whether provided under the original Credit Facilities or
other credit agreement, indenture or otherwise).

          "December 2003 Indenture" means the indenture, dated as of December
22, 2003, among The Bank of New York, as trustee, the Company and the guarantors
party thereto, with respect to the December 2003 Notes.

          "December 2003 Notes" means the $400,000,000 in aggregate principal
amount of the Company's 6-1/8% Senior Subordinated Notes due 2014, issued
pursuant to the December 2003 Indenture on December 22, 2003.

          "Default" means any event that is, or with the passage of time or the
giving of notice or both would be, an Event of Default.

          "Definitive Note" means a certificated Note registered in the name of
the Holder thereof and issued in accordance with Article 2 hereof, substantially
in the form of Exhibit A hereto, except that such Note shall not bear the Global
Note Legend and shall not have the "Schedule of Exchanges of Interests in the
Global Note" attached thereto.

          "Depositary" means, with respect to the Notes issuable or issued in
whole or in part in global form, the Person specified in Section 2.03 hereof as
the Depositary with respect to the Notes, until a successor shall have been
appointed and become such pursuant to the applicable provision of this
Indenture, and, thereafter, "Depositary" shall mean or include such successor.

          "Designated Senior Debt" means (i) any Indebtedness outstanding under
the Senior Credit Facility and (ii) any other Senior Debt permitted under the
Indenture the principal amount of which is $25.0 million or more and that has
been designated by the Company as "Designated Senior Debt".


                                        5



          "Disqualified Stock" means any Capital Stock that, by its terms (or by
the terms of any security into which it is convertible, or for which it is
exchangeable, at the option of the holder thereof), or upon the happening of any
event, matures or is mandatorily redeemable, pursuant to a sinking fund
obligation or otherwise, or redeemable at the option of the Holder thereof, in
whole or in part, on or prior to the date that is 91 days after the date on
which the Notes mature; provided, however, that any Capital Stock that would
constitute Disqualified Stock solely because the holders thereof have the right
to require the Company to repurchase such Capital Stock upon the occurrence of a
Change of Control or an Asset Sale shall not constitute Disqualified Stock if
the terms of such Capital Stock provide that the Company may not repurchase or
redeem any such Capital Stock pursuant to such provisions unless such repurchase
or redemption complies with Section 4.07 hereof; and provided further, that if
such Capital Stock is issued to any plan for the benefit of employees of the
Company or its Subsidiaries or by any such plan to such employees, such Capital
Stock shall not constitute Disqualified Stock solely because it may be required
to be repurchased by the Company in order to satisfy applicable statutory or
regulatory obligations.

          "Equity Interests" means Capital Stock and all warrants, options or
other rights to acquire Capital Stock (but excluding any debt security that is
convertible into, or exchangeable for, Capital Stock).

          "Equity Offering" means any public or private sale of equity
securities (excluding Disqualified Stock) of the Company or Holdings, other than
any private sales to an Affiliate of the Company or Holdings.

          "Euroclear" means Morgan Guaranty Trust Company of New York, Brussels
office, as operator of the Euroclear system.

          "Exchange Act" means the Securities Exchange Act of 1934, as amended.

          "Exchange Notes" means the Notes issued in the Exchange Offer pursuant
to Section 2.06(f).

          "Exchange Offer" has the meaning set forth in the Registration Rights
Agreement.

          "Exchange Offer Registration Statement" has the meaning set forth in
the Registration Rights Agreement.

          "Existing Indebtedness" means any Indebtedness of the Company and its
Restricted Subsidiaries (other than Indebtedness under the Senior Credit
Facility and the Notes) in existence on the date of the Indenture, until such
amounts are repaid.

          "Fixed Charges" means, with respect to any Person for any period, the
sum, without duplication, of (i) the consolidated interest expense of such
Person and its Restricted Subsidiaries for such period, whether paid or accrued
(including, without limitation, original issue discount, non-cash interest
payments, the interest component of any deferred payment obligations, the
interest component of all payments associated with Capital Lease Obligations,
imputed interest with respect to Attributable Debt, commissions, discounts and
other fees and charges incurred in respect of letter of credit or bankers'
acceptance financings, and net


                                        6



payments (if any) pursuant to Hedging Obligations, but excluding amortization of
debt issuance costs) and (ii) the consolidated interest of such Person and its
Restricted Subsidiaries that was capitalized during such period, and (iii) any
interest expense on Indebtedness of another Person that is guaranteed by such
Person or one of its Restricted Subsidiaries or secured by a Lien on assets of
such Person or one of its Restricted Subsidiaries (whether or not such Guarantee
or Lien is called upon) and (iv) the product of (A) all dividend payments,
whether or not in cash, on any series of preferred stock of such Person or any
of its Restricted Subsidiaries, other than dividend payments on Equity Interests
payable solely in Equity Interests of the Company, times (B) a fraction, the
numerator of which is one and the denominator of which is one minus the then
current combined federal, state and local statutory tax rate of such Person,
expressed as a decimal, in each case, on a consolidated basis and in accordance
with GAAP.

          "Fixed Charge Coverage Ratio" means with respect to any Person for any
period, the ratio of the Consolidated Cash Flow of such Person for such period
to the Fixed Charges of such Person and its Restricted Subsidiaries for such
period. In the event that the Company or any of its Restricted Subsidiaries
incurs, assumes, Guarantees or redeems any Indebtedness (other than revolving
credit borrowings) or issues preferred stock subsequent to the commencement of
the period for which the Fixed Charge Coverage Ratio is being calculated but on
or prior to the date on which the event for which the calculation of the Fixed
Charge Coverage Ratio is made (the "Calculation Date"), then the Fixed Charge
Coverage Ratio shall be calculated giving pro forma effect to such incurrence,
assumption, Guarantee or redemption of Indebtedness, or such issuance or
redemption of preferred stock, as if the same had occurred at the beginning of
the applicable four-quarter reference period. In addition, for purposes of
making the computation referred to above, (i) acquisitions that have been made
by the Company or any of its Restricted Subsidiaries, including through mergers
or consolidations and including any related financing transactions, during the
four-quarter reference period or subsequent to such reference period and on or
prior to the Calculation Date shall be deemed to have occurred on the first day
of the four-quarter reference period and Consolidated Cash Flow for such
reference period shall be calculated without giving effect to clause (iii) of
the proviso set forth in the definition of Consolidated Net Income, (ii) the
Consolidated Cash Flow attributable to discontinued operations, as determined in
accordance with GAAP, and operations or businesses disposed of prior to the
Calculation Date, shall be excluded, and (iii) the Fixed Charges attributable to
discontinued operations, as determined in accordance with GAAP, and operations
or businesses disposed of prior to the Calculation Date, shall be excluded, but
only to the extent that the obligations giving rise to such Fixed Charges will
not be obligations of the referent Person or any of its Restricted Subsidiaries
following the Calculation Date.

          "Foreign Subsidiary" means a Restricted Subsidiary of the Company that
was not organized or existing under the laws of the United States, any state
thereof, the District of Columbia or any territory thereof or that has not
guaranteed or otherwise provided direct credit support for any Indebtedness of
the Company.

          "GAAP" means generally accepted accounting principles set forth in the
opinions and pronouncements of the Accounting Principles Board of the American
Institute of Certified Public Accountants and statements and pronouncements of
the Financial Accounting Standards Board or in such other statements by such
other entity as have been approved by a significant segment of the accounting
profession, which were in effect on April 30, 1997.


                                        7



          "Global Notes" means, individually and collectively, each of the
Restricted Global Notes and the Unrestricted Global Notes, substantially in the
form of Exhibit A hereto issued in accordance with Article 2 hereof.

          "Global Note Legend" means the legend set forth in Section 2.06(g)(ii)
to be placed on all Global Notes issued under this Indenture.

          "Government Securities" means direct obligations of, or obligations
guaranteed by, the United States of America for the payment of which guarantee
or obligations the full faith and credit of the United States is pledged.

          "Guarantee" means a guarantee (other than by endorsement of negotiable
instruments for collection in the ordinary course of business), direct or
indirect, in any manner (including, without limitation, letters of credit and
reimbursement agreements in respect thereof), of all or any part of any
Indebtedness.

          "Guarantors" means each Person listed on the signature page hereto and
each Subsidiary of the Company that executes a Subsidiary Guarantee in
accordance with the provisions of the Indenture, and their respective successors
and assigns.

          "Hedging Obligations" means, with respect to any Person, the
obligations of such Person under (i) currency exchange or interest rate swap
agreements, interest rate cap agreements and currency exchange or interest rate
collar agreements and (ii) other agreements or arrangements designed to protect
such Person against fluctuations in currency exchange rates or interest rates.

          "Holder" means a Person in whose name a Note is registered.

          "Holdings" means L-3 Communications Holdings, Inc., a Delaware
corporation.

          "IAI Global Note" means the global Note in the form of Exhibit A
hereto bearing the Global Note Legend and the Private Placement Legend and
deposited with and registered in the name of the Depositary or its nominee that
will be issued in a denomination equal to the outstanding principal amount of
the Notes sold to Institutional Accredited Investors.

          "Indebtedness" means, with respect to any Person, any indebtedness of
such Person, whether or not contingent, in respect of borrowed money or
evidenced by bonds, notes, debentures or similar instruments or letters of
credit (or reimbursement agreements in respect thereof) or banker's acceptances
or representing Capital Lease Obligations or the balance deferred and unpaid of
the purchase price of any property or representing any Hedging Obligations,
except any such balance that constitutes an accrued expense or trade payable, if
and to the extent any of the foregoing indebtedness (other than letters of
credit and Hedging Obligations) would appear as a liability upon a balance sheet
of such Person prepared in accordance with GAAP, as well as all indebtedness of
others secured by a Lien on any asset of such Person (whether or not such
indebtedness is assumed by such Person) and, to the extent not otherwise
included, the Guarantee by such Person of any indebtedness of any other Person.
The amount of any Indebtedness outstanding as of any date shall be (i) the
accreted value thereof, in the case of any Indebtedness that does not require
current payments of interest, and (ii) the


                                        8



principal amount thereof, together with any interest thereon that is more than
30 days past due, in the case of any other Indebtedness.

          "Indenture" means this Indenture, as amended or supplemented from time
to time.

          "Indirect Participant" means a Person who holds a beneficial interest
in a Global Note through a Participant.

          "Initial Notes" means $1.0 billion in aggregate principal amount of
Notes issued under this Indenture on the date hereof.

          "Institutional Accredited Investor" means an institution that is an
"accredited investor" as defined in Rule 501(a)(1), (2), (3) or (7) under the
Securities Act.

          "Investments" means, with respect to any Person, all investments by
such Person in other Persons (including Affiliates) in the forms of direct or
indirect loans (including guarantees of Indebtedness or other obligations),
advances or capital contributions (excluding commission, travel, moving and
similar loans or advances to officers and employees made in the ordinary course
of business), purchases or other acquisitions for consideration of Indebtedness,
Equity Interests or other securities, together with all items that are or would
be classified as investments on a balance sheet prepared in accordance with
GAAP. If the Company or any Restricted Subsidiary of the Company sells or
otherwise disposes of any Equity Interests of any direct or indirect Restricted
Subsidiary of the Company such that, after giving effect to any such sale or
disposition, such Person is no longer a Subsidiary of the Company, the Company
shall be deemed to have made an Investment on the date of any such sale or
disposition equal to the fair market value of the Equity Interests of such
Subsidiary not sold or disposed of in an amount determined as provided in the
last paragraph of the covenant contained in Section 4.07.

          "Legal Holiday" means a Saturday, a Sunday or a day on which banking
institutions in The City of New York or at a place of payment are authorized by
law, regulation or executive order to remain closed. If a payment date is a
Legal Holiday at a place of payment, payment may be made at that place on the
next succeeding day that is not a Legal Holiday, and no interest shall accrue
for the intervening period.

          "Lehman Investor" means Lehman Brothers Holdings Inc. and any of its
Affiliates.

          "Letter of Transmittal" means the letter of transmittal to be prepared
by the Company and sent to all Holders of the Series A Notes for use by such
Holders in connection with the Exchange Offer.

          "Lien" means, with respect to any asset, any mortgage, lien, pledge,
charge, security interest or encumbrance of any kind in respect of such asset,
whether or not filed, recorded or otherwise perfected under applicable law
(including any conditional sale or other title retention agreement, any lease in
the nature thereof, any option or other agreement to sell or give a security
interest in and any filing of or agreement to give any financing statement under
the Uniform Commercial Code (or equivalent statutes) of any jurisdiction).


                                        9



          "Marketable Securities" means, with respect to any Asset Sale, any
readily marketable equity securities that are (i) traded on The New York Stock
Exchange, the American Stock Exchange or the Nasdaq National Market; and (ii)
issued by a corporation having a total equity market capitalization of not less
than $250.0 million; provided that the excess of (A) the aggregate amount of
securities of any one such corporation held by the Company and any Restricted
Subsidiary over (B) ten times the average daily trading volume of such
securities during the 20 immediately preceding trading days shall be deemed not
to be Marketable Securities; as determined on the date of the contract relating
to such Asset Sale.

          "May 2003 Indenture" means the indenture, dated as of May 21, 2003,
among The Bank of New York, as trustee, the Company and the guarantors thereto,
with respect to the May 2003 Notes.

          "May 2003 Notes" means the $400,000,000 in aggregate principal amount
of the Company's 6-1/8% Senior Subordinated Notes due 2013, issued pursuant to
the May 2003 Indenture.

          "Moody's" means Moody's Investors Services, Inc.

          "Net Income" means, with respect to any Person, the net income (loss)
of such Person, determined in accordance with GAAP and before any reduction in
respect of preferred stock dividends, excluding, however, (i) any gain or loss,
together with any related provision for taxes thereon, realized in connection
with (A) any Asset Sale (including, without limitation, dispositions pursuant to
sale and leaseback transactions) or (B) the disposition of any securities by
such Person or any of its Restricted Subsidiaries or the extinguishment of any
Indebtedness of such Person or any of its Restricted Subsidiaries and (ii) any
extraordinary gain or loss, together with any related provision for taxes on
such extraordinary gain or loss and (iii) the cumulative effect of a change in
accounting principles.

          "Net Proceeds" means the aggregate cash proceeds received by the
Company or any of its Subsidiaries in respect of any Asset Sale (including,
without limitation, any cash received upon the sale or other disposition of any
non-cash consideration received in any Asset Sale), net of the direct costs
relating to such Asset Sale (including, without limitation, legal, accounting
and investment banking fees, and sales commissions) and any relocation expenses
incurred as a result thereof, taxes paid or payable as a result thereof (after
taking into account any available tax credits or deductions and any tax sharing
arrangements), amounts required to be applied to the repayment of Indebtedness
secured by a Lien on the asset or assets that were the subject of such Asset
Sale and any reserve for adjustment in respect of the sale price of such asset
or assets established in accordance with GAAP.

          "Non-Recourse Debt" means Indebtedness (i) as to which neither the
Company nor any of its Restricted Subsidiaries (A) provides credit support of
any kind (including any undertaking, agreement or instrument that would
constitute Indebtedness), (B) is directly or indirectly liable (as a guarantor
or otherwise), or (C) constitutes the lender; and (ii) no default with respect
to which (including any rights that the holders thereof may have to take
enforcement action against an Unrestricted Subsidiary) would permit (upon
notice, lapse of time or both) any holder of any other Indebtedness (other than
Indebtedness incurred under Credit Facilities) of the


                                       10



Company or any of its Restricted Subsidiaries to declare a default on such other
Indebtedness or cause the payment thereof to be accelerated or payable prior to
its stated maturity; and (iii) as to which the lenders have been notified in
writing that they will not have any recourse to the stock or assets of the
Company or any of its Restricted Subsidiaries.

          "Non-U.S. Person" means a person who is not a U.S. Person.

          "Note Custodian" means the Trustee, as custodian with respect to the
Notes in global form, or any successor entity thereto.

          "Notes" has the meaning assigned to it in the preamble to this
Indenture. The Initial Notes and the Additional Notes shall be treated as a
single class for all purposes under this Indenture, and unless the context
otherwise requires, all references to the Notes shall include the Initial Notes
and any Additional Notes.

          "November 2004 Indenture" means the indenture, dated as of November
12, 2004, among The Bank of New York, as trustee, the Company and the guarantors
thereto, with respect to the November 2004 Notes.

          "November 2004 Notes" means the $650,000,000 in aggregate principal
amount of the Company's 5-7/8% Senior Subordinated Notes due 2015, issued
pursuant to the November 2004 Indenture on November 12, 2004.

          "Obligations" means any principal, premium and Additional Interest (if
any), interest (including interest accruing on or after the filing of any
petition in bankruptcy or for reorganization, whether or not a claim for
post-filing interest is allowed in such proceeding), penalties, fees, charges,
expenses, indemnifications, reimbursement obligations, damages, guarantees and
other liabilities or amounts payable under the documentation governing any
Indebtedness or in respect thereto.

          "Offering" means the offering of the Notes by the Company.

          "Officer" means, with respect to any Person, the Chairman of the
Board, the Chief Executive Officer, the President, the Chief Operating Officer,
the Chief Financial Officer, the Treasurer, any Assistant Treasurer, the
Controller, the Secretary, any Assistant Secretary or any Vice-President of such
Person.

          "Officers' Certificate" means a certificate signed on behalf of the
Company by two Officers of the Company, one of whom must be the principal
executive officer, the principal financial officer, the treasurer or the
principal accounting officer of the Company, that meets the requirements of
Section 12.05 hereof.

          "Opinion of Counsel" means an opinion from legal counsel who is
reasonably acceptable to the Trustee, that meets the requirements of Section
12.05 hereof. The counsel may be an employee of or counsel to the Company and
any Subsidiary of the Company.


                                       11



          "Participant" means, with respect to DTC, Euroclear or Clearstream, a
Person who has an account with DTC, Euroclear or Clearstream, respectively (and,
with respect to DTC, shall include Euroclear and Clearstream).

          "Permitted Investment" means (i) any Investment in the Company or in a
Restricted Subsidiary of the Company; (ii) any Investment in cash or Cash
Equivalents; (iii) any Investment by the Company or any Restricted Subsidiary of
the Company in a Person, if as a result of such Investment (A) such Person
becomes a Restricted Subsidiary of the Company or (B) such Person is merged,
consolidated or amalgamated with or into, or transfers or conveys substantially
all of its assets to, or is liquidated into, the Company or a Restricted
Subsidiary of the Company; (iv) any Restricted Investment made as a result of
the receipt of non-cash consideration from an Asset Sale that was made pursuant
to and in compliance with Section 4.10 or any disposition of assets not
constituting an Asset sale; (v) any acquisition of assets solely in exchange for
the issuance of Equity Interests (other than Disqualified Stock) of the Company;
(vi) advances to employees not to exceed $2.5 million at any one time
outstanding; (vii) any Investment acquired in connection with or as a result of
a workout or bankruptcy of a customer or supplier; (viii) Hedging Obligations
permitted to be incurred under Section 4.09; (ix) any Investment in a Similar
Business that is not a Restricted Subsidiary; provided that the aggregate fair
market value of all Investments outstanding pursuant to this clause (ix) (valued
on the date each such Investment was made and without giving effect to
subsequent changes in value) may not at any one time exceed 10% of the
Consolidated Tangible Assets of the Company; and (x) other Investments in any
Person having an aggregate fair market value (measured on the date each such
Investment was made and without giving effect to subsequent changes in value),
when taken together with all other Investments made pursuant to this clause (x)
that are at the time outstanding, not to exceed the greater of (a) 5% of
Consolidated Tangible Assets of the Company or (b) $100.0 million.

          "Permitted Joint Venture" means any joint venture, partnership or
other Person designated by the Board of Directors (until designation by the
Board of Directors to the contrary); provided that (i) at least 25% of the
Capital Stock thereof with voting power under ordinary circumstances to elect
directors (or Persons having similar or corresponding powers and
responsibilities) is at the time owned (beneficially or directly) by the Company
and/or by one or more Restricted Subsidiaries of the Company and (ii) such joint
venture, partnership or other Person is engaged in a Similar Business. Any such
designation or designation to the contrary shall be evidenced to the Trustee by
promptly filing with the Trustee a copy of the resolution giving effect to such
designation and an Officers' Certificate certifying that such designation
complied with the foregoing provisions.

          "Permitted Junior Securities" means Equity Interests in the Company or
debt securities that are subordinated to all Senior Debt (and any debt
securities issued in exchange for Senior Debt) to substantially the same extent
as, or to a greater extent than, the Notes and the Subsidiary Guarantees are
subordinated to Senior Debt pursuant to Article 11 of this Indenture.

          "Permitted Liens" means (i) Liens securing Senior Debt of the Company
or any Restricted Subsidiary that was permitted by the terms of this Indenture
to be incurred; (ii) Liens in favor of the Company or any Guarantor; (iii) Liens
on property of a Person existing at the time such Person is merged into or
consolidated with the Company or any Restricted Subsidiary of the


                                       12



Company; provided that such Liens were in existence prior to the contemplation
of such merger or consolidation and do not extend to any assets other than those
of the Person merged into or consolidated with the Company; (iv) Liens on
property existing at the time of acquisition thereof by the Company or any
Subsidiary of the Company, provided that such Liens were in existence prior to
the contemplation of such acquisition and do not extend to any other assets of
the Company or any of its Restricted Subsidiaries; (v) Liens to secure the
performance of statutory obligations, surety or appeal bonds, performance bonds
or other obligations of a like nature incurred in the ordinary course of
business; (vi) Liens to secure Indebtedness (including Capital Lease
Obligations) permitted by clause (iv) of the second paragraph of Section 4.09
covering only the assets acquired with such Indebtedness; (vii) Liens existing
on the date of this Indenture; (viii) Liens for taxes, assessments or
governmental charges or claims that are not yet delinquent or that are being
contested in good faith by appropriate proceedings promptly instituted and
diligently concluded, provided that any reserve or other appropriate provision
as shall be required in conformity with GAAP shall have been made therefor; (ix)
Liens incurred in the ordinary course of business of the Company or any
Restricted Subsidiary of the Company with respect to obligations that do not
exceed $50.0 million at any one time outstanding; (x) Liens on assets of
Guarantors to secure Senior Debt of such Guarantors that were permitted by this
Indenture to be incurred; (xi) Liens securing Permitted Refinancing
Indebtedness, provided that any such Lien does not extend to or cover any
property, shares or debt other than the property, shares or debt securing the
Indebtedness so refunded, refinanced or extended; (xii) Liens incurred or
deposits made to secure the performance of tenders, bids, leases, statutory
obligations, surety and appeal bonds, government contracts, performance and
return of money bonds and other obligations of a like nature, in each case
incurred in the ordinary course of business (exclusive of obligations for the
payment of borrowed money); (xiii) Liens upon specific items of inventory or
other goods and proceeds of any Person securing such Person's obligations in
respect of bankers' acceptances issued or created for the account of such Person
to facilitate the purchase, shipment or storage of such inventory or other goods
in the ordinary course of business; (xiv) Liens encumbering customary initial
deposits and margin deposits, and other Liens incurred in the ordinary course of
business that are within the general parameters customary in the industry, in
each case securing Indebtedness under Hedging Obligations; (xv) Liens
encumbering deposits made in the ordinary course of business to secure
nondelinquent obligations arising from statutory or regulatory, contractual or
warranty requirements of the Company or its Subsidiaries for which a reserve or
other appropriate provision, if any, as shall be required by GAAP shall have
been made; and (xvi) Liens securing Indebtedness and related Hedging Obligations
of Foreign Subsidiaries that are permitted by the terms of this Indenture to be
incurred.

          "Permitted Refinancing Indebtedness" means any Indebtedness of the
Company or any of its Subsidiaries issued in exchange for, or the net proceeds
of which are used to extend, refinance, renew, replace, defease or refund other
Indebtedness of the Company or any of its Restricted Subsidiaries; provided
that: (i) the principal amount (or accreted value, if applicable) of such
Permitted Refinancing Indebtedness does not exceed the principal amount of (or
accreted value, if applicable), plus accrued interest on, the Indebtedness so
extended, refinanced, renewed, replaced, defeased or refunded (plus the amount
of reasonable expenses and prepayment premiums incurred in connection
therewith); (ii) such Permitted Refinancing Indebtedness has a final maturity
date no earlier than the final maturity date of, and has a Weighted Average Life
to Maturity equal to or greater than the Weighted Average Life to Maturity of,
the Indebtedness


                                       13



being extended, refinanced, renewed, replaced, defeased or refunded; (iii) if
the Indebtedness being extended, refinanced, renewed, replaced, defeased or
refunded is subordinated in right of payment to the Notes, such Permitted
Refinancing Indebtedness is subordinated in right of payment to the Notes on
terms at least as favorable to the Holders of Notes as those contained in the
documentation governing the Indebtedness being extended, refinanced, renewed,
replaced, defeased or refunded; and (iv) such Indebtedness is incurred either by
the Company or by the Restricted Subsidiary who is the obligor on the
Indebtedness being extended, refinanced, renewed, replaced, defeased or
refunded.

          "Permitted Securities" means, with respect to any Asset Sale, Voting
Stock of a Person primarily engaged in one or more Similar Businesses; provided
that after giving effect to the Asset Sale such Person shall become a Restricted
Subsidiary and, unless the Asset Sale relates to a Foreign Subsidiary, a
Guarantor (to the extent required by the terms of this Indenture).

          "Person" means any individual, corporation, partnership, joint
venture, association, joint-stock company, trust, unincorporated organization or
government or agency or political subdivision thereof (including any subdivision
or ongoing business of any such entity or substantially all of the assets of any
such entity, subdivision or business).

          "Principals" means any Lehman Investor and Frank C. Lanza.

          "Private Placement Legend" means the legend set forth in Section
2.06(g)(i) to be placed on all Notes issued under this Indenture except as
otherwise permitted by the provisions of this Indenture.

          "Purchase Agreement" means the Purchase Agreement, dated as of July
27, 2005, among the Company, the Guarantors, Lehman Brothers Inc., Banc of
America Securities LLC, Bear Steans & Co. Inc. and Credit Suisse First Boston
LLC, as representatives of the several initial purchasers named therein.

          "QIB" means a "qualified institutional buyer" as defined in Rule 144A.

          "Registration Rights Agreement" means the A/B Exchange Registration
Rights Agreement, dated as of the date hereof, by and among the Company and the
other parties named on the signature pages thereof, as such agreement may be
amended, modified or supplemented from time to time and, with respect to any
Additional Notes, one or more registration rights agreements between the Company
and the other parties thereto, as such agreement(s) may be amended, modified or
supplemented from time to time, relating to rights given by the Company to the
purchasers of Additional Notes to register such Additional Notes under the
Securities Act.

          "Regulation S" means Regulation S promulgated under the Securities
Act.

          "Regulation S Global Note" means a global Note bearing the Private
Placement Legend and deposited with and registered in the name of the Depositary
or its nominee that will be issued in a denomination equal to the outstanding
principal amount of the Notes sold in reliance on Regulation S.


                                       14



          "Related Party" with respect to any Principal means (i) any
controlling stockholder, 50% (or more) owned Subsidiary, or spouse or immediate
family member (in the case of an individual) of such Principal or (ii) any
trust, corporation, partnership or other entity, the beneficiaries,
stockholders, partners, owners or Persons beneficially holding a more than 50%
controlling interest of which consist of such Principal and/or such other
Persons referred to in the immediately preceding clause (i).

          "Representative" means the indenture trustee or other trustee, agent
or representative for any Senior Debt.

          "Responsible Officer" when used with respect to the Trustee, means any
officer within the Corporate Trust Administration of the Trustee (or any
successor group of the Trustee) or any other officer of the Trustee customarily
performing functions similar to those performed by any of the above designated
officers and also means, with respect to a particular corporate trust matter,
any other officer to whom such matter is referred because of his knowledge of
and familiarity with the particular subject.

          "Restricted Definitive Note" means a Definitive Note bearing the
Private Placement Legend.

          "Restricted Global Notes" means the 144A Global Note, the IAI Global
Note and the Regulation S Global Note, each of which shall bear the Private
Placement Legend.

          "Restricted Investment" means an Investment other than a Permitted
Investment.

          "Restricted Period" means the 40-day restricted period as defined in
Regulation S.

          "Restricted Subsidiary" means, with respect to any Person, each
Subsidiary of such Person that is not an Unrestricted Subsidiary.

          "Rule 144" means Rule 144 under the Securities Act.

          "Rule 144A" means Rule 144A under the Securities Act.

          "Rule 903" means Rule 903 under the Securities Act.

          "Rule 904" means Rule 904 under the Securities Act.

          "SEC" means the Securities and Exchange Commission.

          "Securities Act" means the Securities Act of 1933, as amended.

          "Senior Credit Facility" means the amended and restated Credit
Agreement, dated as of the date hereof, as in effect on the date of this
Indenture, among the Company, the lenders party thereto, Bank of America, N.A.,
as administrative agent, and Lehman Commercial Paper Inc., as syndication agent
and documentation agent, and any related notes, collateral documents, letters of
credit and guarantees, including any appendices, exhibits or schedules to any of
the foregoing (as the same may be in effect from time to time), in each case, as
such agreements may


                                       15



be amended, modified, supplemented or restated from time to time, or refunded,
refinanced, restructured, replaced, renewed, repaid or extended from time to
time (whether with the original agents and lenders or other agents and lenders
or otherwise, and whether provided under the original credit agreement or other
credit agreements, indentures or otherwise).

          "Senior Debt" means (i) all Indebtedness of the Company or any of its
Restricted Subsidiaries outstanding under Credit Facilities and all Hedging
Obligations with respect thereto, (ii) any other Indebtedness permitted to be
incurred by the Company or any of its Restricted Subsidiaries under the terms of
the Indenture, unless the instrument under which such Indebtedness is incurred
expressly provides that it is on a parity with or subordinated in right of
payment to the Notes and (iii) all Obligations with respect to the foregoing.
Notwithstanding anything to the contrary in the foregoing, Senior Debt will not
include (i) any liability for federal, state, local or other taxes owed or owing
by the Company, (ii) any Indebtedness of the Company to any of its Subsidiaries
or other Affiliates, (iii) any trade payables or (iv) any Indebtedness that is
incurred in violation of the Indenture. The 2002 Notes, the May 2003 Notes, the
December 2003 Notes, the November 2004 Notes and the obligations of the Company
under its guarantee of the Convertible Notes shall be deemed to rank pari passu
with the Notes and shall not constitute Senior Debt.

          "Shelf Registration Statement" means the Shelf Registration Statement
as defined in the Registration Rights Agreement.

          "Significant Subsidiary" means any Subsidiary which is a "significant
subsidiary" within the meaning of Rule 405 under the Securities Act.

          "Similar Business" means a business, a majority of whose revenues in
the most recently ended calendar year were derived from (i) the sale of defense
products, electronics, communications systems, aerospace products, avionics
products and/or communications products, (ii) any services related thereto,
(iii) any business or activity that is reasonably similar thereto or a
reasonable extension, development or expansion thereof or ancillary thereto, and
(iv) any combination of any of the foregoing.

          "Stated Maturity" means, with respect to any installment of interest
or principal on any series of Indebtedness, the date on which such payment of
interest or principal was scheduled to be paid in the original documentation
governing such Indebtedness, and shall not include any contingent obligations to
repay, redeem or repurchase any such interest or principal prior to the date
originally scheduled for the payment thereof.

          "Subsidiary" means, with respect to any Person, (i) any corporation,
association or other business entity of which more than 50% of the total voting
power of shares of Capital Stock entitled (without regard to the occurrence of
any contingency) to vote in the election of directors, managers or trustees
thereof is at the time owned or controlled, directly or indirectly, by such
Person or one or more of the other Subsidiaries of that Person (or a combination
thereof) and (ii) any partnership (A) the sole general partner or the managing
general partner of which is such Person or a Subsidiary of such Person or (B)
the only general partners of which are such Person or of one or more
Subsidiaries of such Person (or any combination thereof).


                                       16



          "S&P" means Standard and Poor's Corporation.

          "TIA" means the Trust Indenture Act of 1939 (15 U.S.C. Sections
77aaa-77bbbb) as in effect on the date on which this Indenture is qualified
under TIA.

          "Transaction Documents" means the Indenture, the Notes, the Purchase
Agreement and the Registration Rights Agreement.

          "Transfer Restricted Securities" means securities that bear or are
required to bear the Private Placement Legend set forth in Section 2.06(g)(i)
hereof.

          "Trustee" means the party named as such above until a successor
replaces it in accordance with the applicable provisions of this Indenture and
thereafter means the successor serving hereunder.

          "Unrestricted Global Note" means one or more Global Notes, in the form
of Exhibit A attached hereto, that do not and are not required to bear the
Private Placement Legend and are deposited with and registered in the name of
the Depositary or its nominee.

          "Unrestricted Definitive Note" means one or more Definitive Notes that
do not and are not required to bear the Private Placement Legend.

          "Unrestricted Subsidiary" means any Subsidiary that is designated by
the Board of Directors as an Unrestricted Subsidiary pursuant to a resolution of
the Board of Directors, but only to the extent that such Subsidiary: (i) has no
Indebtedness other than Non-Recourse Debt; (ii) is not party to any agreement,
contract, arrangement or understanding with the Company or any Restricted
Subsidiary of the Company unless the terms of any such agreement, contract,
arrangement or understanding are no less favorable to the Company or such
Restricted Subsidiary than those that might be obtained at the time from Persons
who are not Affiliates of the Company; (iii) is a Person with respect to which
neither the Company nor any of its Restricted Subsidiaries has any direct or
indirect obligation (A) to subscribe for additional Equity Interests or (B) to
maintain or preserve such Person's financial condition or to cause such Person
to achieve any specified levels of operating results; (iv) has not guaranteed or
otherwise directly or indirectly provided credit support for any Indebtedness of
the Company or any of its Restricted Subsidiaries; and (v) has at least one
director on its board of directors that is not a director or executive officer
of the Company or any of its Restricted Subsidiaries. Any such designation by
the Board of Directors shall be evidenced to the Trustee by filing with the
Trustee a certified copy of a resolution of the Board of Directors giving effect
to such designation and an Officers' Certificate certifying that such
designation complied with the foregoing conditions and was permitted by Section
4.07. If, at any time, any Unrestricted Subsidiary would fail to meet the
foregoing requirements as an Unrestricted Subsidiary, it shall thereafter cease
to be an Unrestricted Subsidiary for purposes of this Indenture and any
Indebtedness of such Subsidiary shall be deemed to be incurred by a Restricted
Subsidiary of the Company as of such date (and, if such Indebtedness is not
permitted to be incurred as of such date under Section 4.09, the Company shall
be in default of such covenant). The Board of Directors of the Company may at
any time designate any Unrestricted Subsidiary to be a Restricted Subsidiary;
provided that such designation shall be deemed to be an incurrence of
Indebtedness by a Restricted Subsidiary of


                                       17



the Company of any outstanding Indebtedness of such Unrestricted Subsidiary and
such designation shall only be permitted if (i) such Indebtedness is permitted
under Section 4.09, calculated on a pro forma basis as if such designation had
occurred at the beginning of the four-quarter reference period, and (ii) no
Default or Event of Default would be in existence following such designation.

          "U.S. Person" means a U.S. person as defined in Rule 902(k) under the
Securities Act.

          "Voting Stock" of any Person as of any date means the Capital Stock of
such Person that is at the time entitled to vote in the election of the Board of
Directors of such Person.

          "Weighted Average Life to Maturity" means, when applied to any
Indebtedness at any date, the number of years obtained by dividing (i) the sum
of the products obtained by multiplying (A) the amount of each then remaining
installment, sinking fund, serial maturity or other required payments of
principal, including payment at final maturity, in respect thereof, by (B) the
number of years (calculated to the nearest one-twelfth) that will elapse between
such date and the making of such payment, by (ii) the then outstanding principal
amount of such Indebtedness.

          "Wholly Owned" means, when used with respect to any Subsidiary or
Restricted Subsidiary of a Person, a Subsidiary (or Restricted Subsidiary, as
appropriate) of such Person all of the outstanding Capital Stock or other
ownership interests of which (other than directors' qualifying shares) shall at
the time be owned by such Person or by one or more Wholly Owned Subsidiaries (or
Wholly Owned Restricted Subsidiaries, as appropriate) of such Person and one or
more Wholly Owned Subsidiaries (or Wholly Owned Restricted Subsidiaries, as
appropriate) of such Person.

Section 1.02 Other Definitions.

                                                                      Defined in
Term                                                                    Section
----                                                                  ----------
"Affiliate Transaction"............................................        4.11
"Asset Sale Offer".................................................        3.09
"Change of Control Offer"..........................................        4.15
"Change of Control Payment"........................................        4.15
"Change of Control Payment Date"...................................        4.15
"Covenant Defeasance"..............................................        8.03
"DTC"..............................................................        2.03
"Event of Default".................................................        6.01
"Excess Proceeds"..................................................        4.10
"Global Note Legend"...............................................        2.06
"incur"............................................................        4.09
"Legal Defeasance".................................................        8.02
"Offer Amount".....................................................        3.09
"Offer Period".....................................................        3.09
"Paying Agent".....................................................        2.03


                                       18



"Payment Blockage Notice" .........................................       11.03
"Permitted Debt" ..................................................        4.09
"Purchase Date"....................................................        3.09
"Registrar"........................................................        2.03
"Restricted Payments"..............................................        4.07
"Series A Notes"...................................................    preamble

Section 1.03 Incorporation by Reference of Trust Indenture Act.

          Whenever this Indenture refers to a provision of the TIA, the
provision is incorporated by reference in and made a part of this Indenture.

          The following TIA terms used in this Indenture have the following
meanings:

          "indenture securities" means the Notes;

          "indenture security Holder" means a Holder of a Note;

          "indenture to be qualified" means this Indenture;

          "indenture trustee" or "institutional trustee" means the Trustee;

          "obligor" on the Notes means the Company and any successor obligor
upon the Notes.

          All other terms used in this Indenture that are defined by the TIA,
defined by TIA reference to another statute or defined by SEC rule under the TIA
have the meanings so assigned to them.

Section 1.04 Rules of Construction.

          Unless the context otherwise requires:

          (1) a term has the meaning assigned to it;

          (2) an accounting term not otherwise defined has the meaning assigned
     to it in accordance with GAAP;

          (3) "or" is not exclusive;

          (4) words in the singular include the plural, and in the plural
     include the singular;

          (5) provisions apply to successive events and transactions; and

          (6) references to sections of or rules under the Securities Act shall
     be deemed to include substitute, replacement of successor sections or rules
     adopted by the SEC from time to time.


                                       19



                                   ARTICLE 2.
                                    THE NOTES

Section 2.01 Form and Dating.

          The Notes and the Trustee's certificate of authentication shall be
substantially in the form of Exhibit A hereto. The Notes may be issued in the
form of Definitive Notes or Global Notes, as specified by the Company. The Notes
may have notations, legends or endorsements required by law, stock exchange rule
or usage. Each Note shall be dated the date of its authentication. The Notes
shall be in denominations of $100,000 and integral multiples of $1,000 in excess
thereof.

          The terms and provisions contained in the Notes shall constitute, and
are hereby expressly made, a part of this Indenture and the Company and the
Trustee, by their execution and delivery of this Indenture, expressly agree to
such terms and provisions and to be bound thereby. However, to the extent any
provision of any Note conflicts with the express provisions of this Indenture,
the provisions of this Indenture shall govern and be controlling.

          Notes issued in global form shall be substantially in the form of
Exhibit A attached hereto (including the Global Note Legend and the "Schedule of
Exchanges in the Global Note" attached thereto). Notes issued in definitive form
shall be substantially in the form of Exhibit A attached hereto (but without the
Global Note Legend and without the "Schedule of Exchanges of Interests in the
Global Note" attached thereto). Each Global Note shall represent such of the
outstanding Notes as shall be specified therein and each shall provide that it
shall represent the aggregate principal amount of outstanding Notes from time to
time endorsed thereon and that the aggregate principal amount of outstanding
Notes represented thereby may from time to time be reduced or increased, as
appropriate, to reflect exchanges and redemptions. Any endorsement of a Global
Note to reflect the amount of any increase or decrease in the aggregate
principal amount of outstanding Notes represented thereby shall be made by the
Trustee or the Note Custodian, at the direction of the Trustee, in accordance
with instructions given by the Holder thereof as required by Section 2.06
hereof.

          The provisions of the "Operating Procedures of the Euroclear System"
and "Terms and Conditions Governing Use of Euroclear" and the "General Terms and
Conditions of Clearstream Banking" and "Customer Handbook" of Clearstream shall
be applicable to interests in the Regulation S Global Notes that are held by the
Agent Members through Euroclear or Clearstream.

Section 2.02 Execution and Authentication.

          Two Officers shall sign the Notes for the Company by manual or
facsimile signature.

          If an Officer whose signature is on a Note no longer holds that office
at the time a Note is authenticated, the Note shall nevertheless be valid.


                                       20



          A Note shall not be valid until authenticated by the manual signature
of the Trustee. The signature shall be conclusive evidence that the Note has
been authenticated under this Indenture.

          The Trustee shall, upon a written order of the Company signed by two
Officers, authenticate the Initial Notes for original issue up to $1.0 billion
in aggregate principal amount and, upon receipt of an authentication order in
accordance with this Section 2.02, at any time and from time to time thereafter,
the Trustee shall authenticate Additional Notes and Exchange Notes for original
issue in an aggregate principal amount specified in such authentication order.

          The Trustee may appoint an authenticating agent acceptable to the
Company to authenticate Notes. An authenticating agent may authenticate Notes
whenever the Trustee may do so. Each reference in this Indenture to
authentication by the Trustee includes authentication by such agent. An
authenticating agent has the same rights as an Agent to deal with Holders or an
Affiliate of the Company.

Section 2.03 Registrar and Paying Agent.

          The Company shall maintain an office or agency where Notes may be
presented for registration of transfer or for exchange ("Registrar") and an
office or agency where Notes may be presented for payment ("Paying Agent"). The
Registrar shall keep a register of the Notes and of their transfer and exchange.
The Company may appoint one or more co-registrars and one or more additional
paying agents. The term "Registrar" includes any co-registrar and the term
"Paying Agent" includes any additional paying agent. The Company may change any
Paying Agent or Registrar without notice to any Holder. The Company shall notify
the Trustee in writing of the name and address of any Agent not a party to this
Indenture. If the Company fails to appoint or maintain another entity as
Registrar or Paying Agent, the Trustee shall act as such. The Company or any of
its Subsidiaries may act as Paying Agent or Registrar.

          The Company initially appoints The Depository Trust Company ("DTC") to
act as Depositary with respect to the Global Notes.

          The Company initially appoints the Trustee to act as the Registrar and
Paying Agent and to act as Note Custodian with respect to the Global Notes.

Section 2.04 Paying Agent To Hold Money In Trust.

          The Company shall require each Paying Agent other than the Trustee to
agree in writing that the Paying Agent will hold in trust for the benefit of
Holders or the Trustee all money held by the Paying Agent for the payment of
principal, premium or Additional Interest, if any, or interest on the Notes, and
will notify the Trustee of any default by the Company in making any such
payment. While any such default continues, the Trustee may require a Paying
Agent to pay all money held by it to the Trustee. The Company at any time may
require a Paying Agent to pay all money held by it to the Trustee. Upon payment
over to the Trustee, the Paying Agent (if other than the Company or a
Subsidiary) shall have no further liability for the money. If the Company or a
Subsidiary acts as Paying Agent, it shall segregate and hold in a separate trust
fund for the benefit of the Holders all money held by it as Paying Agent. Upon
any


                                       21



bankruptcy or reorganization proceedings relating to the Company, the Trustee
shall serve as Paying Agent for the Notes.

Section 2.05 Holder Lists.

          The Trustee shall preserve in as current a form as is reasonably
practicable the most recent list available to it of the names and addresses of
all Holders and shall otherwise comply with TIA Section 312(a). If the Trustee
is not the Registrar, the Company shall furnish to the Trustee at least five
Business Days before each interest payment date and at such other times as the
Trustee may request in writing, a list in such form and as of such date as the
Trustee may reasonably require of the names and addresses of the Holders of
Notes and the Company shall otherwise comply with TIA Section 312(a).

Section 2.06 Transfer and Exchange.

          (a) Transfer and Exchange of Global Notes. A Global Note may not be
transferred as a whole except by the Depositary to a nominee of the Depositary,
by a nominee of the Depositary to the Depositary or to another nominee of the
Depositary, or by the Depositary or any such nominee to a successor Depositary
or a nominee of such successor Depositary. All Global Notes will be exchanged by
the Company for Definitive Notes if (i) the Company delivers to the Trustee
notice from the Depositary that it is unwilling or unable to continue to act as
Depositary or that it is no longer a clearing agency registered under the
Exchange Act and, in either case, a successor Depositary is not appointed by the
Company within 120 days after the date of such notice from the Depositary or
(ii) the Company in its sole discretion determines that the Global Notes (in
whole but not in part) should be exchanged for Definitive Notes and delivers a
written notice to such effect to the Trustee. Upon the occurrence of either of
the preceding events in (i) or (ii) above, Definitive Notes shall be issued in
such names as the Depositary shall instruct the Trustee. Global Notes also may
be exchanged or replaced, in whole or in part, as provided in Sections 2.07 and
2.11 hereof. Every Note authenticated and made available for delivery in
exchange for, or in lieu of, a Global Note or any portion thereof, pursuant to
Section 2.07 or 2.11 hereof, shall be authenticated and made available for
delivery in the form of, and shall be, a Global Note. A Global Note may not be
exchanged for another Note other than as provided in this Section 2.06(a),
however beneficial interests in a Global Note may be transferred and exchanged
as provided in Section 2.06(b), (c) or (f) hereof.

          (b) Transfer and Exchange of Beneficial Interests in the Global Notes.
The transfer and exchange of beneficial interests in the Global Notes shall be
effected through the Depositary, in accordance with the provisions of this
Indenture and the procedures of the Depositary therefor. Beneficial interests in
the Restricted Global Notes shall be subject to restrictions on transfer
comparable to those set forth herein to the extent required by the Securities
Act. The Trustee shall have no obligation to ascertain the Depositary's
compliance with any such restrictions on transfer. Transfers of beneficial
interests in the Global Notes also shall require compliance with either
subparagraph (i) or (ii) below, as applicable, as well as one or more of the
other following subparagraphs as applicable:

          (i) Transfer of Beneficial Interests in the Same Global Note.
     Beneficial interests in any Restricted Global Note may be transferred to
     Persons who take delivery


                                       22



     thereof in the form of a beneficial interest in the same Restricted Global
     Note in accordance with the transfer restrictions set forth in the Private
     Placement Legend; provided, however, that prior to the expiration of the
     Restricted Period transfers of beneficial interests in the Regulation S
     Global Note may not be made to a U.S. Person or for the account or benefit
     of a U.S. Person (other than an Initial Purchaser). Beneficial interests in
     any Unrestricted Global Note may be transferred only to Persons who take
     delivery thereof in the form of a beneficial interest in an Unrestricted
     Global Note. No written orders or instructions shall be required to be
     delivered to the Registrar to effect the transfers described in this
     Section 2.06(b)(i).

          (ii) All Other Transfers and Exchanges of Beneficial Interests in
     Global Notes. In connection with all transfers and exchanges of beneficial
     interests (other than transfers of beneficial interests in a Global Note to
     Persons who take delivery thereof in the form of a beneficial interest in
     the same Global Note), the transferor of such beneficial interest must
     deliver to the Registrar either (A)(1) a written order from a Participant
     or an Indirect Participant given to the Depositary in accordance with the
     Applicable Procedures directing the Depositary to credit or cause to be
     credited a beneficial interest in the specified Global Note in an amount
     equal to the beneficial interest to be transferred or exchanged and (2)
     instructions given in accordance with the Applicable Procedures containing
     information regarding the Participant account to be credited with such
     increase or (B)(1) a written order from a Participant or an Indirect
     Participant given to the Depositary in accordance with the Applicable
     Procedures directing the Depositary to cause to be issued a Definitive Note
     in an amount equal to the beneficial interest to be transferred or
     exchanged and (2) instructions given by the Depositary to the Registrar
     containing information regarding the Person in whose name such Definitive
     Note shall be registered to effect the transfer or exchange referred to in
     (1) above. Upon an Exchange Offer by the Company in accordance with Section
     2.06(f) hereof, the requirements of this Section 2.06(b)(ii) shall be
     deemed to have been satisfied upon receipt by the Registrar of the
     instructions contained in the Letter of Transmittal delivered by the Holder
     of such beneficial interests in the Restricted Global Notes. Upon
     satisfaction of all of the requirements for transfer or exchange of
     beneficial interests in Global Notes contained in this Indenture, the Notes
     and otherwise applicable under the Securities Act, the Trustee shall adjust
     the principal amount of the relevant Global Note(s) pursuant to Section
     2.06(h) hereof.

          (iii) Transfer of Beneficial Interests to Another Restricted Global
     Note. Beneficial interests in any Restricted Global Note may be transferred
     to Persons who take delivery thereof in the form of a beneficial interest
     in another Restricted Global Note if the Registrar receives the following:

               (A) if the transferee will take delivery in the form of a
          beneficial interest in the 144A Global Note, then the transferor must
          deliver a certificate in the form of Exhibit B hereto, including the
          certifications in item (1) thereof;

               (B) if the transferee will take delivery in the form of a
          beneficial interest in the Regulation S Global Note, then the
          transferor must deliver a


                                       23



          certificate in the form of Exhibit B hereto, including the
          certifications in item (2) thereof; and

               (C) if the transferee will take delivery in the form of a
          beneficial interest in the IAI Global Note, then the transferor must
          deliver (x) a certificate in the form of Exhibit B hereto, including
          the certifications in item (3) thereof, (y) to the extent required by
          item 3(d) of Exhibit B hereto, an Opinion of Counsel in form
          reasonably acceptable to the Company to the effect that such transfer
          is in compliance with the Securities Act and such beneficial interest
          is being transferred in compliance with any applicable blue sky
          securities laws of any State of the United States and (z) if the
          transfer is being made to an Institutional Accredited Investor and
          effected pursuant to an exemption from the registration requirements
          of the Securities Act other than Rule 144A under the Securities Act,
          Rule 144 under the Securities Act or Rule 904 under the Securities
          Act, a certificate from the transferee in the form of Exhibit D
          hereto.

          (iv) Transfer and Exchange of Beneficial Interests in a Restricted
     Global Note for Beneficial Interests in the Unrestricted Global Note.
     Beneficial interests in any Restricted Global Note may be exchanged by any
     holder thereof for a beneficial interest in the Unrestricted Global Note or
     transferred to Persons who take delivery thereof in the form of a
     beneficial interest in the Unrestricted Global Note if:

               (A) such exchange or transfer is effected pursuant to the
          Exchange Offer in accordance with the Registration Rights Agreement
          and the holder, in the case of an exchange, or the transferee, in the
          case of a transfer, is not (1) a broker-dealer, (2) a Person
          participating in the distribution of the Exchange Notes or (3) a
          Person who is an affiliate (as defined in Rule 144) of the Company;

               (B) any such transfer is effected pursuant to the Shelf
          Registration Statement in accordance with the Registration Rights
          Agreement;

               (C) any such transfer is effected by a Broker-Dealer pursuant to
          the Exchange Offer Registration Statement in accordance with the
          Registration Rights Agreement; or

               (D) the Registrar receives the following:

                    (1) if the holder of such beneficial interest in a
               Restricted Global Note proposes to exchange such beneficial
               interest for a beneficial interest in the Unrestricted Global
               Note, a certificate from such holder in the form of Exhibit C
               hereto, including the certifications in item (1)(a) thereof;

                    (2) if the holder of such beneficial interest in a
               Restricted Global Note proposes to transfer such beneficial
               interest to a Person who shall take delivery thereof in the form
               of a beneficial interest in the Unrestricted Global Note, a
               certificate from such holder in the form of Exhibit B hereto,
               including the certifications in item (4) thereof;


                                       24



                    (3) in each such case set forth in this subparagraph (D), an
               Opinion of Counsel in form reasonably acceptable to the Registrar
               to the effect that such exchange or transfer is in compliance
               with the Securities Act, that the restrictions on transfer
               contained herein and in the Private Placement Legend are not
               required in order to maintain compliance with the Securities Act,
               and such beneficial interest is being exchanged or transferred in
               compliance with any applicable blue sky securities laws of any
               State of the United States.

          If any such transfer is effected pursuant to subparagraph (B) or (D)
above at a time when an Unrestricted Global Note has not yet been issued, the
Company shall issue and, upon receipt of an authentication order in accordance
with Section 2.02 hereof, the Trustee shall authenticate one or more
Unrestricted Global Notes in an aggregate principal amount equal to the
principal amount of beneficial interests transferred pursuant to subparagraph
(B) or (D) above.

          Beneficial interests in an Unrestricted Global Note cannot be
exchanged for, or transferred to Persons who take delivery thereof in the form
of, a beneficial interest in any Restricted Global Note.

          (c) Transfer or Exchange of Beneficial Interests for Definitive Notes.

          (i) If any holder of a beneficial interest in a Restricted Global Note
     proposes to exchange such beneficial interest for a Definitive Note or to
     transfer such beneficial interest to a Person who takes delivery thereof in
     the form of a Definitive Note, then, upon receipt by the Registrar of the
     following documentation (all of which may be submitted by facsimile):

               (A) if the holder of such beneficial interest in a Restricted
          Global Note proposes to exchange such beneficial interest for a
          Definitive Note, a certificate from such holder in the form of Exhibit
          C hereto, including the certifications in item (2)(a) thereof;

               (B) if such beneficial interest is being transferred to a QIB in
          accordance with Rule 144A under the Securities Act, a certificate to
          the effect set forth in Exhibit B hereto, including the certifications
          in item (1) thereof;

               (C) if such beneficial interest is being transferred to a
          Non-U.S. Person in an offshore transaction in accordance with Rule 904
          under the Securities Act, a certificate to the effect set forth in
          Exhibit B hereto, including the certifications in item (2) thereof;

               (D) if such beneficial interest is being transferred pursuant to
          an exemption from the registration requirements of the Securities Act
          in accordance with Rule 144 under the Securities Act, a certificate to
          the effect set forth in Exhibit B hereto, including the certifications
          in item (3)(a) thereof;

               (E) if such beneficial interest is being transferred to an
          Institutional Accredited Investor in reliance on an exemption from the
          registration


                                       25



          requirements of the Securities Act other than those listed in
          subparagraphs (B) through (D) above, a certificate to the effect set
          forth in Exhibit B hereto, including the certifications in item (3)(d)
          thereof, a certificate from the transferee to the effect set forth in
          Exhibit D hereof and, to the extent required by item 3(d) of Exhibit
          B, an Opinion of Counsel from the transferee or the transferor
          reasonably acceptable to the Company to the effect that such transfer
          is in compliance with the Securities Act and such beneficial interest
          is being transferred in compliance with any applicable blue sky
          securities laws of any State of the United States;

               (F) if such beneficial interest is being transferred to the
          Company or any of its Subsidiaries, a certificate to the effect set
          forth in Exhibit B hereto, including the certifications in item (3)(b)
          thereof; or

               (G) if such beneficial interest is being transferred pursuant to
          an effective registration statement under the Securities Act, a
          certificate to the effect set forth in Exhibit B hereto, including the
          certifications in item (3)(c) thereof, the Trustee shall cause the
          aggregate principal amount of the applicable Global Note to be reduced
          accordingly pursuant to Section 2.06(h) hereof, and the Company shall
          execute and the Trustee shall authenticate and deliver to the Person
          designated in the instructions a Definitive Note in the appropriate
          principal amount. Definitive Notes issued in exchange for beneficial
          interests in a Restricted Global Note pursuant to this Section 2.06(c)
          shall be registered in such names and in such authorized denominations
          as the holder shall instruct the Registrar through instructions from
          the Depositary and the Participant or Indirect Participant. The
          Trustee shall deliver such Definitive Notes to the Persons in whose
          names such Notes are so registered. Definitive Notes issued in
          exchange for a beneficial interest in a Restricted Global Note
          pursuant to this Section 2.06(c)(i) shall bear the Private Placement
          Legend and shall be subject to all restrictions on transfer contained
          therein.

          (ii) Notwithstanding 2.06(c)(i), a holder of a beneficial interest in
     a Restricted Global Note may exchange such beneficial interest for an
     Unrestricted Definitive Note or may transfer such beneficial interest to a
     Person who takes delivery thereof in the form of an Unrestricted Definitive
     Note only if:

               (A) such exchange or transfer is effected pursuant to the
          Exchange Offer in accordance with the Registration Rights Agreement
          and the holder, in the case of an exchange, or the transferee, in the
          case of a transfer, is not (1) a broker-dealer, (2) a Person
          participating in the distribution of the Exchange Notes or (3) a
          Person who is an affiliate (as defined in Rule 144) of the Company;

               (B) any such transfer is effected pursuant to the Shelf
          Registration Statement in accordance with the Registration Rights
          Agreement;


                                       26



               (C) any such transfer is effected by a Broker-Dealer pursuant to
          the Exchange Offer Registration Statement in accordance with the
          Registration Rights Agreement; or

               (D) the Registrar receives the following:

                    (1) if the holder of such beneficial interest in a
               Restricted Global Note proposes to exchange such beneficial
               interest for a Definitive Note that does not bear the Private
               Placement Legend, a certificate from such holder in the form of
               Exhibit C hereto, including the certifications in item (1)(b)
               thereof;

                    (2) if the holder of such beneficial interest in a
               Restricted Global Note proposes to transfer such beneficial
               interest to a Person who shall take delivery thereof in the form
               of a Definitive Note that does not bear the Private Placement
               Legend, a certificate from such holder in the form of Exhibit B
               hereto, including the certifications in item (4) thereof; and

                    (3) in each such case set forth in this subparagraph (D), an
               Opinion of Counsel in form reasonably acceptable to the Company,
               to the effect that such exchange or transfer is in compliance
               with the Securities Act, that the restrictions on transfer
               contained herein and in the Private Placement Legend are not
               required in order to maintain compliance with the Securities Act,
               and such beneficial interest in a Restricted Global Note is being
               exchanged or transferred in compliance with any applicable blue
               sky securities laws of any State of the United States.

          (iii) If any holder of a beneficial interest in an Unrestricted Global
     Note proposes to exchange such beneficial interest for a Definitive Note or
     to transfer such beneficial interest to a Person who takes delivery thereof
     in the form of a Definitive Note, then, upon satisfaction of the conditions
     set forth in Section 2.06(b)(ii), the Trustee shall cause the aggregate
     principal amount of the applicable Global Note to be reduced accordingly
     pursuant to Section 2.06(h) hereof, and the Company shall execute and the
     Trustee shall authenticate and deliver to the Person designated in the
     instructions a Definitive Note in the appropriate principal amount.
     Definitive Notes issued in exchange for a beneficial interest pursuant to
     this Section 2.06(c)(iii) shall be registered in such names and in such
     authorized denominations as the holder shall instruct the Registrar through
     instructions from the Depositary and the Participant or Indirect
     Participant. The Trustee shall deliver such Definitive Notes to the Persons
     in whose names such Notes are so registered. Definitive Notes issued in
     exchange for a beneficial interest pursuant to this section 2.06(c)(iii)
     shall not bear the Private Placement Legend. Beneficial interests in an
     Unrestricted Global Note cannot be exchanged for a Definitive Note bearing
     the Private Placement Legend or transferred to a Person who takes delivery
     thereof in the form of a Definitive Note bearing the Private Placement
     Legend.

          (d) Transfer or Exchange of Definitive Notes for Beneficial Interests.


                                       27



          (i) If any Holder of Restricted Definitive Notes proposes to exchange
     such Notes for a beneficial interest in a Restricted Global Note or to
     transfer such Definitive Notes to a Person who takes delivery thereof in
     the form of a beneficial interest in a Restricted Global Note, then, upon
     receipt by the Registrar of the following documentation (all of which may
     be submitted by facsimile):

               (A) if the Holder of such Restricted Definitive Notes proposes to
          exchange such Notes for a beneficial interest in a Restricted Global
          Note, a certificate from such Holder in the form of Exhibit C hereto,
          including the certifications in item (2)(b) thereof;

               (B) if such Definitive Notes are being transferred to a QIB in
          accordance with Rule 144A under the Securities Act, a certificate to
          the effect set forth in Exhibit B hereto, including the certifications
          in item (1) thereof;

               (C) if such Definitive Notes are being transferred to a Non-U.S.
          Person in an offshore transaction in accordance with Rule 904 under
          the Securities Act, a certificate to the effect set forth in Exhibit B
          hereto, including the certifications in item (2) thereof;

               (D) if such Definitive Notes are being transferred pursuant to an
          exemption from the registration requirements of the Securities Act in
          accordance with Rule 144 under the Securities Act, a certificate to
          the effect set forth in Exhibit B hereto, including the certifications
          in item (3)(a) thereof;

               (E) if such Definitive Notes are being transferred to an
          Institutional Accredited Investor in reliance on an exemption from the
          registration requirements of the Securities Act other than those
          listed in subparagraphs (B) through (D) above, a certificate to the
          effect set forth in Exhibit B hereto, including the certifications in
          item (3)(d) thereof, a certificate from the transferee to the effect
          set forth in Exhibit D hereof and, to the extent required by item 3(d)
          of Exhibit B, an Opinion of Counsel from the transferee or the
          transferor reasonably acceptable to the Company to the effect that
          such transfer is in compliance with the Securities Act and such
          Definitive Notes are being transferred in compliance with any
          applicable blue sky securities laws of any State of the United States;

               (F) if such Definitive Notes are being transferred to the Company
          or any of its Subsidiaries, a certificate to the effect set forth in
          Exhibit B hereto, including the certifications in item (3)(b) thereof;
          or

               (G) if such Definitive Notes are being transferred pursuant to an
          effective registration statement under the Securities Act, a
          certificate to the effect set forth in Exhibit B hereto, including the
          certifications in item (3)(c) thereof,

     the Trustee shall cancel the Definitive Notes, increase or cause to be
     increased the aggregate principal amount of, in the case of clause (A)
     above, the appropriate Restricted


                                       28



     Global Note, in the case of clause (B) above, the 144A Global Note, in the
     case of clause (C) above, the Regulation S Global Note, and in all other
     cases, the IAI Global Note.

          (ii) A Holder of Restricted Definitive Notes may exchange such Notes
     for a beneficial interest in the Unrestricted Global Note or transfer such
     Restricted Definitive Notes to a Person who takes delivery thereof in the
     form of a beneficial interest in the Unrestricted Global Note only if:

               (A) such exchange or transfer is effected pursuant to the
          Exchange Offer in accordance with the Registration Rights Agreement
          and the Holder, in the case of an exchange, or the transferee, in the
          case of a transfer, is not (1) a broker-dealer, (2) a Person
          participating in the distribution of the Exchange Notes or (3) a
          Person who is an affiliate (as defined in Rule 144) of the Company;

               (B) any such transfer is effected pursuant to the Shelf
          Registration Statement in accordance with the Registration Rights
          Agreement;

               (C) any such transfer is effected by a Broker-Dealer pursuant to
          the Exchange Offer Registration Statement in accordance with the
          Registration Rights Agreement; or

               (D) the Registrar receives the following:

                    (1) if the Holder of such Definitive Notes proposes to
               exchange such Notes for a beneficial interest in the Unrestricted
               Global Note, a certificate from such Holder in the form of
               Exhibit C hereto, including the certifications in item (1)(c)
               thereof;

                    (2) if the Holder of such Definitive Notes proposes to
               transfer such Notes to a Person who shall take delivery thereof
               in the form of a beneficial interest in the Unrestricted Global
               Note, a certificate from such Holder in the form of Exhibit B
               hereto, including the certifications in item (4) thereof; and

                    (3) in each such case set forth in this subparagraph (D), an
               Opinion of Counsel in form reasonably acceptable to the Company
               to the effect that such exchange or transfer is in compliance
               with the Securities Act, that the restrictions on transfer
               contained herein and in the Private Placement Legend are not
               required in order to maintain compliance with the Securities Act,
               and such Definitive Notes are being exchanged or transferred in
               compliance with any applicable blue sky securities laws of any
               State of the United States.

     Upon satisfaction of the conditions of any of the subparagraphs in this
     Section 2.06(d)(ii), the Trustee shall cancel the Definitive Notes and
     increase or cause to be increased the aggregate principal amount of the
     Unrestricted Global Note.


                                       29



          (iii) A Holder of Unrestricted Definitive Notes may exchange such
     Notes for a beneficial interest in the Unrestricted Global Note or transfer
     such Definitive Notes to a Person who takes delivery thereof in the form of
     a beneficial interest in the Unrestricted Global Note. Upon receipt of a
     request for such an exchange or transfer, the Trustee shall cancel the
     Unrestricted Definitive Notes and increase or cause to be increased the
     aggregate principal amount of the Unrestricted Global Note.

          If any such exchange or transfer from a Definitive Note to a
beneficial interest is effected pursuant to subparagraphs (ii)(B), (ii)(D) or
(iii) above at a time when an Unrestricted Global Note has not yet been issued,
the Company shall issue and, upon receipt of an authentication order in
accordance with Section 2.02 hereof, the Trustee shall authenticate one or more
Unrestricted Global Notes in an aggregate principal amount equal to the
principal amount of beneficial interests transferred pursuant to subparagraphs
(ii)(B), (ii)(D) or (iii) above.

          (e) Transfer and Exchange of Definitive Notes. Upon request by a
Holder of Definitive Notes and such Holder's compliance with the provisions of
this Section 2.06(e), the Registrar shall register the transfer or exchange of
Definitive Notes. Prior to such registration of transfer or exchange, the
requesting Holder shall present or surrender to the Registrar the Definitive
Notes duly endorsed or accompanied by a written instruction of transfer in form
satisfactory to the Registrar duly executed by such Holder or by his attorney,
duly authorized in writing. In addition, the requesting Holder shall provide any
additional certifications, documents and information, as applicable, pursuant to
the provisions of this Section 2.06(e).

          (i) Restricted Definitive Notes may be transferred to and registered
     in the name of Persons who take delivery thereof if the Registrar receives
     the following:

               (A) if the transfer will be made pursuant to Rule 144A under the
          Securities Act, then the transferor must deliver a certificate in the
          form of Exhibit B hereto, including the certifications in item (1)
          thereof;

               (B) if the transfer will be made pursuant to Rule 904, then the
          transferor must deliver a certificate in the form of Exhibit B hereto,
          including the certifications in item (2) thereof; and

               (C) if the transfer will be made pursuant to any other exemption
          from the registration requirements of the Securities Act, then the
          transferor must deliver (x) a certificate in the form of Exhibit B
          hereto, including the certifications in item (3) thereof, (y) to the
          extent required by item 3(d) of Exhibit B hereto, an Opinion of
          Counsel in form reasonably acceptable to the Company to the effect
          that such transfer is in compliance with the Securities Act and such
          beneficial interest is being transferred in compliance with any
          applicable blue sky securities laws of any State of the United States
          and (z) if the transfer is being made to an Institutional Accredited
          Investor and effected pursuant to an exemption from the registration
          requirements of the Securities Act other than Rule 144A under the
          Securities Act, Rule 144 under the Securities Act or Rule 904 under
          the Securities Act, a certificate from the transferee in the form of
          Exhibit D hereto.


                                       30



          (ii) Restricted Definitive Notes may be exchanged by any Holder
     thereof for an Unrestricted Definitive Note or transferred to Persons who
     take delivery thereof in the form of an Unrestricted Definitive Note if:

               (A) such exchange or transfer is effected pursuant to the
          Exchange Offer in accordance with the Registration Rights Agreement
          and the holder, in the case of an exchange, or the transferee, in the
          case of a transfer, is not (1) a broker-dealer, (2) a Person
          participating in the distribution of the Exchange Notes or (3) a
          Person who is an affiliate (as defined in Rule 144) of the Company;

               (B) any such transfer is effected pursuant to the Shelf
          Registration Statement in accordance with the Registration Rights
          Agreement;

               (C) any such transfer is effected by a Broker-Dealer pursuant to
          the Exchange Offer Registration Statement in accordance with the
          Registration Rights Agreement; or

               (D) the Registrar receives the following:

                    (1) if the Holder of such Restricted Definitive Notes
               proposes to exchange such Notes for an Unrestricted Definitive
               Note, a certificate from such Holder in the form of Exhibit C
               hereto, including the certifications in item (1)(a) thereof;

                    (2) if the Holder of such Restricted Definitive Notes
               proposes to transfer such Notes to a Person who shall take
               delivery thereof in the form of an Unrestricted Definitive Note,
               a certificate from such Holder in the form of Exhibit B hereto,
               including the certifications in item (4) thereof; and

                    (3) in each such case set forth in this subparagraph (D), an
               Opinion of Counsel in form reasonably acceptable to the Company
               to the effect that such exchange or transfer is in compliance
               with the Securities Act, that the restrictions on transfer
               contained herein and in the Private Placement Legend are not
               required in order to maintain compliance with the Securities Act,
               and such Restricted Definitive Note is being exchanged or
               transferred in compliance with any applicable blue sky securities
               laws of any State of the United States.

          (iii) A Holder of Unrestricted Definitive Notes may transfer such
     Notes to a Person who takes delivery thereof in the form of an Unrestricted
     Definitive Note. Upon receipt of a request for such a transfer, the
     Registrar shall register the Unrestricted Definitive Notes pursuant to the
     instructions from the Holder thereof. Unrestricted Definitive Notes cannot
     be exchanged for or transferred to Persons who take delivery thereof in the
     form of a Restricted Definitive Note.

          (f) Exchange Offer. Upon the occurrence of the Exchange Offer in
accordance with the Registration Rights Agreement, the Company shall issue and,
upon receipt


                                       31



of an authentication order in accordance with Section 2.02, the Trustee shall
authenticate (i) one or more Unrestricted Global Notes in an aggregate principal
amount equal to the principal amount of the beneficial interests in the
Restricted Global Notes tendered for acceptance by persons that are not (x)
broker-dealers, (y) Persons participating in the distribution of the Exchange
Notes or (z) Persons who are affiliates (as defined in Rule 144) of the Company
and accepted for exchange in the exchange Offer and (ii) Definitive Notes in an
aggregate principal amount equal to the principal amount of the Restricted
Definitive Notes accepted for exchange in the Exchange Offer. Concurrent with
the issuance of such Notes, the Trustee shall cause the aggregate principal
amount of the applicable Restricted Global Notes to be reduced accordingly, and
the Company shall execute and the Trustee shall authenticate and make available
for delivery to the Persons designated by the Holders of Definitive Notes so
accepted Definitive Notes in the appropriate principal amount.

          (g) Legends. The following legends shall appear on the face of all
Global Notes and Definitive Notes issued under this Indenture unless
specifically stated otherwise in the applicable provisions of this Indenture.

          (i)  Private Placement Legend.

               (A) Except as permitted by subparagraph (B) below, each Global
          Note and each Definitive Note (and all Notes issued in exchange
          therefor or substitution thereof) shall bear the legend in
          substantially the following form:

     "THE SECURITY (OR ITS PREDECESSOR) EVIDENCED HEREBY WAS ORIGINALLY ISSUED
     IN A TRANSACTION EXEMPT FROM REGISTRATION UNDER SECTION 5 OF THE UNITED
     STATES SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), AND THE
     SECURITY EVIDENCED HEREBY MAY NOT BE OFFERED, SOLD OR OTHERWISE TRANSFERRED
     IN THE ABSENCE OF SUCH REGISTRATION OR AN APPLICABLE EXEMPTION THEREFROM.
     EACH PURCHASER OF THE SECURITY EVIDENCED HEREBY IS HEREBY NOTIFIED THAT THE
     SELLER MAY BE RELYING ON THE EXEMPTION FROM THE PROVISIONS OF SECTION 5 OF
     THE SECURITIES ACT PROVIDED BY RULE 144A THEREUNDER. THE HOLDER OF THE
     SECURITY EVIDENCED HEREBY AGREES FOR THE BENEFIT OF L-3 COMMUNICATIONS
     CORPORATION THAT (A) SUCH SECURITY MAY BE RESOLD, PLEDGED OR OTHERWISE
     TRANSFERRED, ONLY (1)(a) TO A PERSON WHO THE SELLER REASONABLY BELIEVES IS
     A QUALIFIED INSTITUTIONAL BUYER (AS DEFINED IN RULE 144A UNDER THE
     SECURITIES ACT) IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 144A, (b)
     IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 144 UNDER THE SECURITIES
     ACT, (c) OUTSIDE THE UNITED STATES TO A FOREIGN PERSON IN A TRANSACTION
     MEETING THE REQUIREMENTS OF RULE 904 UNDER THE SECURITIES ACT OR (d) IN
     ACCORDANCE WITH ANOTHER EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE
     SECURITIES ACT (AND BASED UPON AN OPINION OF COUNSEL IF L-3 COMMUNICATIONS
     CORPORATION SO REQUESTS), (2) TO L-3 COMMUNICATIONS CORPORATION OR (3)
     PURSUANT TO AN EFFECTIVE REGISTRATION


                                       32



     STATEMENT AND, IN EACH CASE, IN ACCORDANCE WITH ANY APPLICABLE SECURITIES
     LAWS OF ANY STATE OF THE UNITED STATES OR ANY OTHER APPLICABLE JURISDICTION
     AND (B) THE HOLDER WILL, AND EACH SUBSEQUENT HOLDER IS REQUIRED TO, NOTIFY
     ANY PURCHASER FROM IT OF THE SECURITY EVIDENCED HEREBY OF THE RESALE
     RESTRICTIONS SET FORTH IN (A) ABOVE."

               (B) Notwithstanding the foregoing, any Global Note or Definitive
          Note issued pursuant to subparagraphs (b)(iv), (c)(ii), (c)(iii),
          (d)(ii), (d)(iii), (e)(ii), (e)(iii) or (f) to this Section 2.06 (and
          all Notes issued in exchange therefor or substitution thereof) shall
          not bear the Private Placement Legend.

          (ii) Global Note Legend. Each Global Note shall bear a legend in
     substantially the following form:

     "THIS GLOBAL NOTE IS HELD BY THE DEPOSITARY (AS DEFINED IN THE INDENTURE
     GOVERNING THIS NOTE) OR ITS NOMINEE IN CUSTODY FOR THE BENEFIT OF THE
     BENEFICIAL OWNERS HEREOF, AND IS NOT TRANSFERABLE TO ANY PERSON UNDER ANY
     CIRCUMSTANCES EXCEPT THAT (I) THE TRUSTEE MAY MAKE SUCH NOTATIONS HEREON AS
     MAY BE REQUIRED PURSUANT TO SECTION 2.07 OF THE INDENTURE, (II) THIS GLOBAL
     NOTE MAY BE EXCHANGED IN WHOLE BUT NOT IN PART PURSUANT TO SECTION 2.06(a)
     OF THE INDENTURE, (III) THIS GLOBAL NOTE MAY BE DELIVERED TO THE TRUSTEE
     FOR CANCELLATION PURSUANT TO SECTION 2.11 OF THE INDENTURE AND (IV) THIS
     GLOBAL NOTE MAY BE TRANSFERRED TO A SUCCESSOR DEPOSITARY WITH THE PRIOR
     WRITTEN CONSENT OF THE COMPANY."

          (h) Cancellation and/or Adjustment of Global Notes. At such time as
all beneficial interests in a particular Global Note have been exchanged for
Definitive Notes or a particular Global Note has been redeemed, repurchased or
canceled in whole and not in part, each such Global Note shall be returned to or
retained and canceled by the Trustee in accordance with Section 2.11 hereof. At
any time prior to such cancellation, if any beneficial interest in a Global Note
is exchanged for or transferred to a Person who will take delivery thereof in
the form of a beneficial interest in another Global Note or for Definitive
Notes, the principal amount of Notes represented by such Global Note shall be
reduced accordingly and an endorsement shall be made on such Global Note, by the
Trustee or by the Depositary at the direction of the Trustee, to reflect such
reduction; and if the beneficial interest is being exchanged for or transferred
to a Person who will take delivery thereof in the form of a beneficial interest
in another Global Note, such other Global Note shall be increased accordingly
and an endorsement shall be made on such Global Note, by the Trustee or by the
Depositary at the direction of the Trustee, to reflect such increase.

          (i) General Provisions Relating to Transfers and Exchanges.


                                       33



          (i) To permit registrations of transfers and exchanges, the Company
     shall execute and the Trustee shall authenticate Global Notes and
     Definitive Notes upon the Company's order or at the Registrar's request.

          (ii) No service charge shall be made to a holder of a beneficial
     interest in a Global Note or to a Holder of a Definitive Note for any
     registration of transfer or exchange, but the Company may require payment
     of a sum sufficient to cover any transfer tax or similar governmental
     charge payable in connection therewith (other than any such transfer taxes
     or similar governmental charge payable upon exchange or transfer pursuant
     to Sections 2.10, 3.06, 4.10, 4.15 and 9.05 hereof).

          (iii) The Registrar shall not be required to register the transfer of
     or exchange any Note selected for redemption in whole or in part, except
     the unredeemed portion of any Note being redeemed in part.

          (iv) All Global Notes and Definitive Notes issued upon any
     registration of transfer or exchange of Global Notes or Definitive Notes
     shall be the valid obligations of the Company, evidencing the same debt,
     and entitled to the same benefits under this Indenture, as the Global Notes
     or Definitive Notes surrendered upon such registration of transfer or
     exchange.

          (v) The Company shall not be required (A) to issue, to register the
     transfer of or to exchange Notes during a period beginning at the opening
     of business 15 days before the day of any selection of Notes for redemption
     under Section 3.02 hereof and ending at the close of business on the day of
     selection, (B) to register the transfer of or to exchange any Note so
     selected for redemption in whole or in part, except the unredeemed portion
     of any Note being redeemed in part or (C) to register the transfer of or to
     exchange a Note between a record date and the next succeeding interest
     payment date.

          (vi) Prior to due presentment for the registration of a transfer of
     any Note, the Trustee, any Agent and the Company may deem and treat the
     Person in whose name any Note is registered as the absolute owner of such
     Note for the purpose of receiving payment of principal of and interest on
     such Notes and for all other purposes, and none of the Trustee, any Agent
     or the Company shall be affected by notice to the contrary.

          (vii) The Trustee shall authenticate Global Notes and Definitive Notes
     in accordance with the provisions of Section 2.02 hereof.

          (viii) The Trustee shall have no obligation or duty to monitor,
     determine or inquire as to compliance with any restrictions on transfer
     imposed under this Indenture or under applicable law with respect to any
     transfer of any interest in any Note (including any transfers between or
     among depositary participants or beneficial owners of interests in any
     Global Note) other than to require delivery of such certificates and other
     documentation or evidence as are expressly required by, and to do so if and
     when expressly required by the terms of, this Indenture, and to examine the
     same to determine substantial compliance as to form with the express
     requirements hereof.


                                       34



Section 2.07 Replacement Notes.

          If any mutilated Note is surrendered to the Trustee, or the Company
and the Trustee receives evidence to its satisfaction of the destruction, loss
or theft of any Note, the Company shall issue and the Trustee, upon the written
order of the Company signed by two Officers of the Company, shall authenticate a
replacement Note if the Trustee's requirements are met. If required by the
Trustee or the Company, an indemnity bond must be supplied by the Holder that is
sufficient in the judgment of the Trustee and the Company to protect the
Company, the Trustee, any Agent and any authenticating agent from any loss that
any of them may suffer if a Note is replaced. The Company may charge for its
expenses in replacing a Note.

          Every replacement Note is an additional obligation of the Company and
shall be entitled to all of the benefits of this Indenture equally and
proportionately with all other Notes duly issued hereunder.

Section 2.08 Outstanding Notes.

          The Notes outstanding at any time are all the Notes authenticated by
the Trustee except for those canceled by it, those delivered to it for
cancellation, those reductions in the interest in a Global Note effected by the
Trustee in accordance with the provisions hereof, and those described in this
Section as not outstanding. Except as set forth in Section 2.09 hereof, a Note
does not cease to be outstanding because the Company or an Affiliate of the
Company holds the Note.

          If a Note is replaced pursuant to Section 2.07 hereof, it ceases to be
outstanding unless the Trustee receives proof satisfactory to it that the
replaced Note is held by a bona fide purchaser.

          If the principal amount of any Note is considered paid under Section
4.01 hereof, it ceases to be outstanding and interest on it ceases to accrue.

          If the Paying Agent (other than the Company, a Subsidiary or an
Affiliate of any thereof) holds, on a redemption date or maturity date, money
sufficient to pay Notes payable on that date, then on and after that date such
Notes shall be deemed to be no longer outstanding and shall cease to accrue
interest.

Section 2.09 Treasury Notes.

          In determining whether the Holders of the required principal amount of
Notes have concurred in any direction, waiver or consent, Notes owned by the
Company, or by any Person directly or indirectly controlling or controlled by or
under direct or indirect common control with the Company, shall be considered as
though not outstanding, except that for the purposes of determining whether the
Trustee shall be protected in relying on any such direction, waiver or consent,
only Notes that a Trustee knows are so owned shall be so disregarded.


                                       35



Section 2.10 Temporary Notes.

          Until Definitive Notes are ready for delivery, the Company may prepare
and the Trustee shall authenticate temporary Notes upon a written order of the
Company signed by two Officers of the Company. Temporary Notes shall be
substantially in the form of Definitive Notes but may have variations that the
Company considers appropriate for temporary Notes and as shall be reasonably
acceptable to the Trustee. Without unreasonable delay, the Company shall prepare
and the Trustee shall authenticate Definitive Notes in exchange for temporary
Notes.

          Holders of temporary Notes shall be entitled to all of the benefits of
this Indenture.

Section 2.11 Cancellation.

          The Company at any time may deliver Notes to the Trustee for
cancellation. The Registrar and Paying Agent shall forward to the Trustee any
Notes surrendered to them for registration of transfer, exchange or payment. The
Trustee and no one else shall cancel all Notes surrendered for registration of
transfer, exchange, payment, replacement or cancellation and shall destroy
canceled Notes (subject to the record retention requirement of the Exchange
Act). Certification of the destruction of all canceled Notes shall be delivered
to the Company. The Company may not issue new Notes to replace Notes that it has
paid or that have been delivered to the Trustee for cancellation.

Section 2.12 Defaulted Interest.

          If the Company defaults in a payment of interest on the Notes, it
shall pay the defaulted interest in any lawful manner plus, to the extent
lawful, interest payable on the defaulted interest, to the Persons who are
Holders on a subsequent special record date, in each case at the rate provided
in the Notes and in Section 4.01 hereof. The Company shall notify the Trustee in
writing of the amount of defaulted interest proposed to be paid on each Note and
the date of the proposed payment. The Company shall fix or cause to be fixed
each such special record date and payment date, provided that no such special
record date shall be less than 10 days prior to the related payment date for
such defaulted interest. At least 15 days before the special record date, the
Company (or, upon the written request of the Company, the Trustee in the name
and at the expense of the Company) shall mail or cause to be mailed to Holders a
notice that states the special record date, the related payment date and the
amount of such interest to be paid.

Section 2.13 CUSIP Numbers.

          The Company in issuing the Notes may use CUSIP numbers (if then
generally in use), and, if so, the Trustee shall use CUSIP numbers in notices of
redemption as a convenience to Holders; provided that any such notice may state
that no representation is made as to the correctness of such numbers either as
printed on the Notes or as contained in any notice of a redemption and that
reliance may be placed only on the other identification numbers printed on the
Notes, and any such redemption shall not be affected by any defect in or
omission of such numbers. The Company will promptly notify the Trustee of any
change in the CUSIP numbers.


                                       36



                                   ARTICLE 3.
                            REDEMPTION AND PREPAYMENT

Section 3.01 Notices to Trustee.

          If the Company elects to redeem Notes pursuant to the optional
redemption provisions of Section 3.07 hereof, it shall furnish to the Trustee,
at least 30 days but not more than 60 days before a redemption date, an
Officers' Certificate setting forth (i) the clause of this Indenture pursuant to
which the redemption shall occur, (ii) the redemption date, (iii) the principal
amount of Notes to be redeemed and (iv) the redemption price.

Section 3.02 Selection of Notes to Be Redeemed.

          If less than all of the Notes are to be redeemed at any time,
selection of Notes for redemption shall be made by the Trustee in compliance
with the requirements of the principal national securities exchange, if any, on
which the Notes are listed, or, if the Notes are not so listed, on a pro rata
basis, by lot or by such method as the Trustee shall deem fair and appropriate;
provided that no Notes of $100,000 or less shall be redeemed in part. Notices of
redemption shall be mailed by first class mail at least 30 but not more than 60
days before the redemption date to each Holder of Notes to be redeemed at its
registered address. Notices of redemption may not be conditional. If any Note is
to be redeemed in part only, the notice of redemption that relates to such Note
shall state the portion of the principal amount thereof to be redeemed. A new
Note in principal amount equal to the unredeemed portion thereof shall be issued
in the name of the Holder thereof upon cancellation of the original Note. Notes
called for redemption become due on the date fixed for redemption. On and after
the redemption date, interest ceases to accrue on Notes or portions of them
called for redemption.

          The Trustee shall promptly notify the Company in writing of the Notes
selected for redemption and, in the case of any Note selected for partial
redemption, the principal amount thereof to be redeemed. Notes and portions of
Notes selected shall be in amounts of $100,000 or whole multiples of $1,000 in
excess thereof; except that if all of the Notes of a Holder are to be redeemed,
the entire outstanding amount of Notes held by such Holder, even if not a
multiple of $1,000, shall be redeemed. Except as provided in the preceding
sentence, provisions of this Indenture that apply to Notes called for redemption
also apply to portions of Notes called for redemption.

Section 3.03 Notice Of Redemption.

          Subject to the provisions of Section 3.09 hereof, at least 30 days but
not more than 60 days before a redemption date, the Company shall mail or cause
to be mailed, by first class mail, a notice of redemption to each Holder whose
Notes are to be redeemed at its registered address.

          The notice shall identify the Notes to be redeemed (including CUSIP
Numbers, if any) and shall state:

          (a) the redemption date;


                                       37



          (b) the redemption price;

          (c) if any Note is being redeemed in part, the portion of the
     principal amount of such Note to be redeemed and that, after the redemption
     date upon surrender of such Note, a new Note or Notes in principal amount
     equal to the unredeemed portion shall be issued upon cancellation of the
     original Note;

          (d) the name and address of the Paying Agent;

          (e) that Notes called for redemption must be surrendered to the Paying
     Agent to collect the redemption price;

          (f) that, unless the Company defaults in making such redemption
     payment, interest on Notes called for redemption ceases to accrue on and
     after the redemption date;

          (g) the paragraph of the Notes and/or Section of this Indenture
     pursuant to which the Notes called for redemption are being redeemed; and

          (h) that no representation is made as to the correctness or accuracy
     of the CUSIP number, if any, listed in such notice or printed on the Notes.

          At the Company's request, the Trustee shall give the notice of
redemption in the Company's name and at its expense; provided, however, that the
Company shall have delivered to the Trustee, at least 45 days prior to the
redemption date, an Officers' Certificate requesting that the Trustee give such
notice and setting forth the information to be stated in such notice as provided
in the preceding paragraph.

Section 3.04 Effect Of Notice Of Redemption.

          Once notice of redemption is mailed in accordance with Section 3.03
hereof, Notes called for redemption become irrevocably due and payable on the
redemption date at the redemption price. A notice of redemption may not be
conditional.

Section 3.05 Deposit Of Redemption Price.

          Prior to 11:00 a.m. on the Business Day prior to the redemption date,
the Company shall deposit with the Trustee or with the Paying Agent money
sufficient to pay the redemption price of and accrued interest on all Notes to
be redeemed on that date. The Trustee or the Paying Agent shall promptly return
to the Company any money deposited with the Trustee or the Paying Agent by the
Company in excess of the amounts necessary to pay the redemption price of, and
accrued interest on, all Notes to be redeemed.

          If the Company complies with the provisions of the preceding
paragraph, on and after the redemption date, interest shall cease to accrue on
the Notes or the portions of Notes called for redemption. If a Note is redeemed
on or after an interest record date but on or prior to the related interest
payment date, then any accrued and unpaid interest shall be paid to the Person
in whose name such Note was registered at the close of business on such record
date. If any Note called for redemption shall not be so paid upon surrender for
redemption because of the failure of


                                       38



the Company to comply with the preceding paragraph, interest shall be paid on
the unpaid principal, from the redemption date until such principal is paid, and
to the extent lawful on any interest not paid on such unpaid principal, in each
case at the rate provided in the Notes and in Section 4.01 hereof.

Section 3.06 Notes Redeemed In Part.

          Upon surrender of a Note that is redeemed in part, the Company shall
issue and, upon the Company's written request, the Trustee shall authenticate
for the Holder at the expense of the Company a new Note equal in principal
amount to the unredeemed portion of the Note surrendered.

Section 3.07 Optional Redemption.

          (a) Except as set forth in clause (b) of this Section 3.7, the Notes
shall not be redeemable at the Company's option prior to October 15, 2010.
Thereafter, the Notes shall be subject to redemption at any time at the option
of the Company, in whole or in part, upon not less than 30 nor more than 60
days' notice, at the redemption prices (expressed as percentages of principal
amount) set forth below plus accrued and unpaid interest and Additional Interest
thereon, if any, to the applicable redemption date, if redeemed during the
twelve-month period beginning on October 15 of the years indicated below:

Year                                Percentage
----                                ----------
2010.............................    103.188%
2011.............................    102.125%
2012.............................    101.063%
2013 and thereafter..............    100.000%

          (b) Notwithstanding the foregoing clause (a), before October 15, 2008,
the Company may on any one or more occasions redeem up to an aggregate of 35% of
the Notes originally issued at a redemption price of 106.375% of the principal
amount thereof, plus accrued and unpaid interest and Additional Interest
thereon, if any, to the redemption date, with the net cash proceeds of one or
more Equity Offerings by the Company or the net cash proceeds of one or more
Equity Offerings by Holdings that are contributed to the Company as common
equity capital; provided that at least 65% of the Notes originally issued remain
outstanding immediately after the occurrence of each such redemption; and
provided, further, that any such redemption must occur within 120 days of the
date of the closing of such Equity Offering.

Section 3.08 Mandatory Redemption.

          Except as set forth under Sections 4.10 and 4.15, the Company is not
required to make mandatory redemption or sinking fund payments with respect to
the Notes.


                                       39



Section 3.09 Offer To Purchase By Application Of Excess Proceeds.

          In the event that, pursuant to Section 4.10 hereof, the Company shall
be required to commence an offer to all Holders to purchase Notes (an "Asset
Sale Offer"), it shall follow the procedures specified below.

          The Asset Sale Offer shall remain open for a period of 20 Business
Days following its commencement and no longer, except to the extent that a
longer period is required by applicable law (the "Offer Period"). No later than
five Business Days after the termination of the Offer Period (the "Purchase
Date"), the Company shall purchase the principal amount of Notes required to be
purchased pursuant to Section 4.10 hereof (the "Offer Amount") or, if less than
the Offer Amount has been tendered, all Notes tendered in response to the Asset
Sale Offer. Payment for any Notes so purchased shall be made in the same manner
as interest payments are made.

          If the Purchase Date is on or after an interest record date and on or
before the related interest payment date, any accrued and unpaid interest shall
be paid to the Person in whose name a Note is registered at the close of
business on such record date, and no additional interest shall be payable to
Holders who tender Notes pursuant to the Asset Sale Offer.

          Upon the commencement of an Asset Sale Offer, the Company shall send,
by first class mail, a notice to the Trustee and each of the Holders, with a
copy to the Trustee. The notice shall contain all instructions and materials
necessary to enable such Holders to tender Notes pursuant to the Asset Sale
Offer. The Asset Sale Offer shall be made to all Holders. The notice, which
shall govern the terms of the Asset Sale Offer, shall state:

          (a) that the Asset Sale Offer is being made pursuant to this Section
     3.09 and Section 4.10 hereof and the length of time the Asset Sale Offer
     shall remain open;

          (b) the Offer Amount, the purchase price and the Purchase Date;

          (c) that any Note not tendered or accepted for payment shall continue
     to accrete or accrue interest;

          (d) that, unless the Company defaults in making such payment, any Note
     accepted for payment pursuant to the Asset Sale Offer shall cease to
     accrete or accrue interest after the Purchase Date;

          (e) that Holders electing to have a Note purchased pursuant to an
     Asset Sale Offer may only elect to have all of such Note purchased and may
     not elect to have only a portion of such Note purchased;

          (f) that Holders electing to have a Note purchased pursuant to any
     Asset Sale Offer shall be required to surrender the Note, with the form
     entitled "Option of Holder to Elect Purchase" on the reverse of the Note
     completed, or transfer by book-entry transfer, to the Company, a
     depositary, if appointed by the Company, or a Paying Agent at the address
     specified in the notice at least three days before the Purchase Date;


                                       40



          (g) that Holders shall be entitled to withdraw their election if the
     Company, the Depositary or the Paying Agent, as the case may be, receives,
     not later than the expiration of the Offer Period, a facsimile transmission
     or letter setting forth the name of the Holder, the principal amount of the
     Note the Holder delivered for purchase and a statement that such Holder is
     withdrawing his election to have such Note purchased;

          (h) that, if the aggregate principal amount of Notes surrendered by
     Holders exceeds the Offer Amount, the Company shall select the Notes to be
     purchased on a pro rata basis (with such adjustments as may be deemed
     appropriate by the Company so that only Notes in denominations of $100,000,
     or integral multiples of $1,000 in excess thereof, shall be purchased); and

          (i) that Holders whose Notes were purchased only in part shall be
     issued new Notes equal in principal amount to the unpurchased portion of
     the Notes surrendered (or transferred by book-entry transfer).

          On or before the Purchase Date, the Company shall, to the extent
lawful, accept for payment, on a pro rata basis to the extent necessary, the
Offer Amount of Notes or portions thereof tendered pursuant to the Asset Sale
Offer, or if less than the Offer Amount has been tendered, all Notes tendered,
and shall deliver to the Trustee an Officers' Certificate stating that such
Notes or portions thereof were accepted for payment by the Company in accordance
with the terms of this Section 3.09. The Company, the Depositary or the Paying
Agent, as the case may be, shall promptly (but in any case not later than five
days after the Purchase Date) mail or deliver to each tendering Holder an amount
equal to the purchase price of the Notes tendered by such Holder and accepted by
the Company for purchase, and the Company shall promptly issue a new Note, and
the Trustee, upon written request from the Company shall authenticate and mail
or deliver such new Note to such Holder, in a principal amount equal to any
unpurchased portion of the Note surrendered. Any Note not so accepted shall be
promptly mailed or delivered by the Company to the Holder thereof. The Company
shall publicly announce the results of the Asset Sale Offer on the Purchase
Date.

          Other than as specifically provided in this Section 3.09, any purchase
pursuant to this Section 3.09 shall be made pursuant to the provisions of
Sections 3.01 through 3.06 hereof.

                                   ARTICLE 4.
                                    COVENANTS

Section 4.01 Payment Of Notes.

          The Company shall pay or cause to be paid the principal of, premium,
if any, and interest on the Notes on the dates and in the manner provided in the
Notes. Principal, premium, if any, and interest shall be considered paid on the
date due if the Paying Agent, if other than the Company or a Subsidiary thereof,
holds as of 10:00 a.m. Eastern Time on the due date money deposited by the
Company in immediately available funds and designated for and sufficient to pay
all principal, premium, if any, and interest then due. The Company shall pay all
Additional Interest, if any, in the same manner on the dates and in the amounts
set forth in the Registration Rights Agreement.


                                       41



          The Company shall pay interest (including post-petition interest in
any proceeding under any Bankruptcy Law) on overdue principal at the rate equal
to 1.0% per annum in excess of the then applicable interest rate on the Notes to
the extent lawful; it shall pay interest (including post-petition interest in
any proceeding under any Bankruptcy Law) on overdue installments of interest and
Additional Interest (without regard to any applicable grace period) at the same
rate to the extent lawful.

Section 4.02 Maintenance Of Office Or Agency.

          The Company shall maintain in the Borough of Manhattan, The City of
New York, an office or agency (which may be an office of the Trustee or an
affiliate of the Trustee, Registrar or co-registrar) where Notes may be
surrendered for registration of transfer or for exchange and where notices and
demands to or upon the Company in respect of the Notes and this Indenture may be
served. The Company shall give prompt written notice to the Trustee of the
location, and any change in the location, of such office or agency. If at any
time the Company shall fail to maintain any such required office or agency or
shall fail to furnish the Trustee with the address thereof, such presentations,
surrenders, notices and demands may be made or served at the Corporate Trust
Office of the Trustee.

          The Company may also from time to time designate one or more other
offices or agencies where the Notes may be presented or surrendered for any or
all such purposes and may from time to time rescind such designations; provided,
however, that no such designation or rescission shall in any manner relieve the
Company of its obligation to maintain an office or agency in the Borough of
Manhattan, The City of New York for such purposes. The Company shall give prompt
written notice to the Trustee of any such designation or rescission and of any
change in the location of any such other office or agency.

          The Company hereby designates the Corporate Trust Office of the
Trustee as one such office or agency of the Company in accordance with Section
2.03.

Section 4.03 Reports.

          Notwithstanding that the Company may not be subject to the reporting
requirements of Section 13 or 15(d) of the Exchange Act or otherwise report on
an annual and quarterly basis on forms provided for such annual and quarterly
reporting pursuant to rules and regulations promulgated by the SEC, the Company
shall file with the SEC (and provide the Trustee and Holders with copies
thereof), without cost to each Holder, within 15 days after it files them with
the SEC:

          (a) within 90 days after the end of each fiscal year, annual reports
     on Form 10-K (or any successor or comparable form) containing the
     information required to be contained therein (or required in such successor
     or comparable form);

          (b) within 45 days after the end of each of the first three fiscal
     quarters of each fiscal year, reports on Form 10-Q (or any successor or
     comparable form);


                                       42



          (c) promptly from time to time after the occurrence of an event
     required to be therein reported, such other reports on Form 8-K (or any
     successor or comparable form); and

          (d) any other information, documents and other reports which the
     Company would be required to file with the SEC if it were subject to
     Section 13 or 15(d) of the Exchange Act; provided, however, the Company
     shall not be so obligated to file such reports with the SEC if the SEC does
     not permit such filing, in which event the Company will make available such
     information to prospective purchasers of Notes, in addition to providing
     such information to the Trustee and the Holders, in each case within 15
     days after the time the Company would be required to file such information
     with the SEC, if it were subject to Sections 13 or 15(d) of the Exchange
     Act.

          Subject to the provisions of Article 7, delivery of such reports,
information and documents to the Trustee is for informational purposes only and
the Trustee's receipt of such shall not constitute constructive notice of any
information contained therein or determinable from information contained
therein, including the Company's compliance with any of its covenants hereunder
(as to which the Trustee is entitled to rely exclusively on Officers'
Certificates).

Section 4.04 Compliance Certificate.

          (a) The Company shall deliver to the Trustee, within 90 days after the
end of each fiscal year, an Officers' Certificate stating that a review of the
activities of the Company and its Subsidiaries during the preceding fiscal year
has been made under the supervision of the signing Officers with a view to
determining whether the Company has kept, observed, performed and fulfilled its
obligations under this Indenture, and further stating, as to each such Officer
signing such certificate, that to the best of his or her knowledge the Company
has kept, observed, performed and fulfilled each and every covenant contained in
this Indenture and is not in default in the performance or observance of any of
the terms, provisions and conditions of this Indenture (or, if a Default or
Event of Default shall have occurred, describing all such Defaults or Events of
Default of which he or she may have knowledge and what action the Company is
taking or proposes to take with respect thereto) and that to the best of his or
her knowledge no event has occurred and remains in existence by reason of which
payments on account of the principal of or interest, if any, on the Notes is
prohibited or if such event has occurred, a description of the event and what
action the Company is taking or proposes to take with respect thereto.

          (b) So long as not contrary to the then current recommendations of the
American Institute of Certified Public Accountants, the year-end financial
statements delivered pursuant to Section 4.03(a) above shall be accompanied by a
written statement of the Company's independent public accountants (who shall be
a firm of established national reputation) that in making the examination
necessary for certification of such financial statements, nothing has come to
their attention that would lead them to believe that the Company has violated
any provisions of Article 4 or Article 5 hereof or, if any such violation has
occurred, specifying the nature and period of existence thereof, it being
understood that such accountants shall not be liable directly or indirectly to
any Person for any failure to obtain knowledge of any such violation.


                                       43



          (c) The Company shall, so long as any of the Notes are outstanding,
deliver to the Trustee, as soon as possible and in any event within five
Business Days after any Officer becoming aware of any Default or Event of
Default, an Officers' Certificate specifying such Default or Event of Default
and what action the Company is taking or proposes to take with respect thereto.

Section 4.05 Taxes.

          The Company shall pay, and shall cause each of its Subsidiaries to
pay, prior to delinquency, all material taxes, assessments, and governmental
levies except such as are contested in good faith and by appropriate proceedings
or where the failure to effect such payment is not adverse in any material
respect to the Holders of the Notes.

Section 4.06 Stay, Extension and Usury Laws

          The Company and each of the Guarantors covenants (to the extent that
it may lawfully do so) that it will not at any time insist upon, plead, or in
any manner whatsoever claim or take the benefit or advantage of, any stay,
extension or usury law wherever enacted, now or at any time hereafter in force,
that may affect the covenants or the performance of this Indenture; and, to the
extent that it may lawfully do so, the Company and each of the Guarantors hereby
expressly waives all benefit or advantage of any such law, and covenants that it
will not, by resort to any such law, hinder, delay or impede the execution of
any power herein granted to the Trustee, but will suffer and permit the
execution of every such power as though no such law has been enacted.

Section 4.07 Restricted Payments.

          The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, directly or indirectly: (i) declare or pay any dividend or make
any other payment or distribution on account of the Company's or any of its
Restricted Subsidiaries' Equity Interests (including, without limitation, any
payment in connection with any merger or consolidation involving the Company) or
to the direct or indirect holders of the Company's or any of its Restricted
Subsidiaries' Equity Interests in their capacity as such (other than (A)
dividends or distributions payable in Equity Interests (other than Disqualified
Stock) of the Company or (B) dividends or distributions by a Restricted
Subsidiary so long as, in the case of any dividend or distribution payable on or
in respect of any class or series of securities issued by a Restricted
Subsidiary other than a Wholly Owned Restricted Subsidiary, the Company or a
Restricted Subsidiary receives at least its pro rata share of such dividend or
distribution in accordance with its Equity Interests in such class or series of
securities); (ii) purchase, redeem or otherwise acquire or retire for value
(including without limitation, in connection with any merger or consolidation
involving the Company) any Equity Interests of the Company or any direct or
indirect parent of the Company; (iii) make any payment on or with respect to, or
purchase, redeem, defease or otherwise acquire or retire for value any
Indebtedness that is subordinated to the Notes except a payment of interest or
principal at Stated Maturity; or (iv) make any Restricted Investment (all such
payments and other actions set forth in clauses (i) through (iv) above being
collectively referred to as "Restricted Payments"), unless, at the time of and
after giving effect to such Restricted Payment:


                                       44



          (a) no Default or Event of Default shall have occurred and be
     continuing or would occur as a consequence thereof; and

          (b) the Company would, at the time of such Restricted Payment and
     after giving pro forma effect thereto as if such Restricted Payment had
     been made at the beginning of the applicable four-quarter period, have been
     permitted to incur at least $1.00 of additional Indebtedness pursuant to
     the Fixed Charge Coverage Ratio test set forth in the first paragraph of
     Section 4.09; and

          (c) such Restricted Payment, together with the aggregate amount of all
     other Restricted Payments made by the Company and its Restricted
     Subsidiaries since April 30, 1997 (excluding Restricted Payments permitted
     by clauses (ii) through (viii) of the next succeeding paragraph or of the
     kind contemplated by such clauses that were made prior to the date of this
     Indenture), is less than the sum of (i) 50% of the Consolidated Net Income
     of the Company for the period (taken as one accounting period) from July 1,
     1997 to the end of the Company's most recently ended fiscal quarter for
     which internal financial statements are available at the time of such
     Restricted Payment (or, if such Consolidated Net Income for such period is
     a deficit, less 100% of such deficit), plus (ii) 100% of the aggregate net
     cash proceeds received by the Company since April 30, 1997 as a
     contribution to its common equity capital or from the issue or sale of
     Equity Interests of the Company (other than Disqualified Stock) or from the
     issue or sale of Disqualified Stock or debt securities of the Company that
     have been converted into such Equity Interests (other than Equity Interests
     (or Disqualified Stock or convertible debt securities) sold to a Subsidiary
     of the Company and other than Disqualified Stock or convertible debt
     securities that have been converted into Disqualified Stock), plus (iii) to
     the extent that any Restricted Investment that was made after April 30,
     1997 is sold for cash or otherwise liquidated or repaid for cash, the
     amount of cash received in connection therewith (or from the sale of
     Marketable Securities received in connection therewith), plus (iv) to the
     extent not already included in such Consolidated Net Income of the Company
     for such period and without duplication, (A) 100% of the aggregate amount
     of cash received as a dividend from an Unrestricted Subsidiary, (B) 100% of
     the cash received upon the sale of Marketable Securities received as a
     dividend from an Unrestricted Subsidiary, and (C) 100% of the net assets of
     any Unrestricted Subsidiary on the date that it becomes a Restricted
     Subsidiary.

          The foregoing provisions shall not prohibit: (i) the payment of any
dividend within 60 days after the date of declaration thereof, if at said date
of declaration such payment would have complied with the provisions of this
Indenture; (ii) the redemption, repurchase, retirement, defeasance or other
acquisition of any subordinated Indebtedness or Equity Interests of the Company
in exchange for, or out of the net cash proceeds of the substantially concurrent
sale (other than to a Subsidiary of the Company) of, other Equity Interests of
the Company (other than any Disqualified Stock); provided that the amount of any
such net cash proceeds that are utilized for any such redemption, repurchase,
retirement, defeasance or other acquisition shall be excluded from clause
(c)(ii) of the preceding paragraph; (iii) the defeasance, redemption, repurchase
or other acquisition of subordinated Indebtedness (other than intercompany
Indebtedness) in exchange for, or with the net cash proceeds from an incurrence
of, Permitted Refinancing Indebtedness; (iv) the repurchase, retirement or other
acquisition or retirement for


                                       45



value of common Equity Interests of the Company or Holdings held by any future,
present or former employee, director or consultant of the Company or any
Subsidiary or Holdings issued pursuant to any management equity plan or stock
option plan or any other management or employee benefit plan or agreement;
provided, however, that the aggregate amount of Restricted Payments made under
this clause (iv) does not exceed $15.0 million in any calendar year and provided
further that cancellation of Indebtedness owing to the Company from members of
management of the Company or any of its Restricted Subsidiaries in connection
with a repurchase of Equity Interests of the Company shall not be deemed to
constitute a Restricted Payment for purposes of this covenant or any other
provision of this Indenture; (v) repurchases of Equity Interests deemed to occur
upon exercise of stock options upon surrender of Equity Interests to pay the
exercise price of such options; (vi) payments to Holdings (A) in amounts equal
to the amounts required for Holdings to pay franchise taxes and other fees
required to maintain its legal existence and provide for other operating costs
of up to $5.0 million per fiscal year and (B) in amounts equal to amounts
required for Holdings to pay federal, state and local income taxes to the extent
such income taxes are actually due and owing; provided that the aggregate amount
paid under this clause (B) does not exceed the amount that the Company would be
required to pay in respect of the income of the Company and its Subsidiaries if
the Company were a stand alone entity that was not owned by Holdings; (vii)
dividends paid to Holdings in amounts equal to amounts required for Holdings to
pay interest and/or principal on Indebtedness that has been guaranteed by, or is
otherwise considered Indebtedness of, the Company; and (viii) other Restricted
Payments in an aggregate amount since May 22, 1998 not to exceed $100.0 million.

          The Board of Directors of the Company may designate any Restricted
Subsidiary to be an Unrestricted Subsidiary if such designation would not cause
a Default. For purposes of making such determination, all outstanding
Investments by the Company and its Restricted Subsidiaries (except to the extent
repaid in cash) in the Subsidiary so designated shall be deemed to be Restricted
Payments at the time of such designation and shall reduce the amount available
for Restricted Payments under the first paragraph of this covenant. All such
outstanding Investments shall be deemed to constitute Investments in an amount
equal to the fair market value of such Investments at the time of such
designation. Such designation shall only be permitted if such Restricted Payment
would be permitted at such time and if such Restricted Subsidiary otherwise
meets the definition of an Unrestricted Subsidiary.

          The amount of all Restricted Payments (other than cash) shall be the
fair market value on the date of the Restricted Payment of the asset(s) or
securities proposed to be transferred or issued by the Company or such
Restricted Subsidiary, as the case may be, pursuant to the Restricted Payment.
The fair market value of any non-cash Restricted Payment shall be determined by
the Board of Directors whose resolution with respect thereto shall be delivered
to the Trustee.

Section 4.08 Dividend And Other Payment Restrictions Affecting Restricted
Subsidiaries.

          The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, directly or indirectly, create or otherwise cause or suffer to
exist or become effective any encumbrance or restriction on the ability of any
Restricted Subsidiary to (i)(A) pay dividends or make any other distributions to
the Company or any of its Restricted Subsidiaries (1) on its


                                       46



Capital Stock or (2) with respect to any other interest or participation in, or
measured by, its profits, or (B) pay any indebtedness owed to the Company or any
of its Restricted Subsidiaries, (ii) make loans or advances to the Company or
any of its Restricted Subsidiaries, or (iii) transfer any of its properties or
assets to the Company or any of its Restricted Subsidiaries. However, the
preceding restrictions will not apply to encumbrances or restrictions existing
under or by reason of (A) the provisions of security agreements that restrict
the transfer of assets that are subject to a Lien created by such security
agreements, (B) the provisions of agreements governing Indebtedness incurred
pursuant to clause (v) of the second paragraph of Section 4.09, (C) the Senior
Credit Facility, this Indenture, the Notes, the Exchange Notes, the 2002 Notes,
the 2002 Indenture, the May 2003 Notes, the May 2003 Indenture, the December
2003 Notes, the December 2003 Indenture, the November 2004 Notes and the
November 2004 Indenture, (D) applicable law, (E) any instrument governing
Indebtedness or Capital Stock of a Person acquired by the Company or any of its
Restricted Subsidiaries as in effect at the time of such acquisition (except to
the extent such Indebtedness was incurred in connection with or in contemplation
of such acquisition), which encumbrance or restriction is not applicable to any
Person, or the properties or assets of any Person, other than the Person, or the
property or assets of the Person, so acquired, provided that, in the case of
Indebtedness, such Indebtedness was permitted by the terms of this Indenture to
be incurred, (F) by reason of customary non-assignment provisions in leases
entered into in the ordinary course of business and consistent with past
practices, (G) purchase money obligations for property acquired in the ordinary
course of business that impose restrictions of the nature described in this
clause (iii) of the preceding paragraph, (H) Permitted Refinancing Indebtedness,
provided that the restrictions contained in the agreements governing such
Permitted Refinancing Indebtedness are not materially more restrictive, taken as
a whole, than those contained in the agreements governing the Indebtedness being
refinanced, (I) contracts for the sale of assets, including, without limitation,
customary restrictions with respect to a Subsidiary pursuant to an agreement
that has been entered into for the sale or disposition of all or substantially
all of the Capital Stock or assets of such Subsidiary, (J) agreements relating
to secured Indebtedness otherwise permitted to be incurred pursuant to 4.09 and
4.12 that limit the right of the debtor to dispose of the assets securing such
Indebtedness, (K) restrictions on cash or other deposits or net worth imposed by
customers under contracts entered into in the ordinary course of business, (L)
customary provisions in joint venture agreements and other similar agreements
entered into in the ordinary course of business, (M) any encumbrance or
restriction with respect to a Foreign Subsidiary pursuant to any agreement
relating to Indebtedness Incurred by such Foreign Subsidiary; provided that such
Indebtedness was permitted by the terms of the Indenture to be incurred, or (N)
any encumbrances or restrictions of the type referred to in clauses (i), (ii)
and (iii) of the first paragraph under this covenant imposed by any amendments,
modifications, restatements, renewals, increases, supplements, refundings,
replacements or refinancings of the contracts, instruments or obligations
referred to in clauses (A) through (M) above; provided that such amendments,
modifications, restatements, renewals, increases, supplements, refundings,
replacements or refinancings are, in the good faith judgment of the Company, no
more restrictive, taken as a whole, than those contained in such contract,
instrument or obligation prior to such amendment, modification, restatement,
renewal, increase, supplement, refunding, replacement or refinancing.


                                       47



Section 4.09 Incurrence of Indebtedness and Issuance Of Preferred Stock.

          The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, directly or indirectly, create, incur, issue, assume, guarantee
or otherwise become directly or indirectly liable, contingently or otherwise,
with respect to (collectively, "incur") any Indebtedness (including Acquired
Debt) and that the Company shall not issue any Disqualified Stock and shall not
permit any of its Restricted Subsidiaries to issue any shares of preferred
stock; provided, however, that the Company and any Restricted Subsidiary may
incur Indebtedness (including Acquired Debt) or issue shares of preferred stock
if the Fixed Charge Coverage Ratio for the Company's most recently ended four
full fiscal quarters for which internal financial statements are available
immediately preceding the date on which such additional Indebtedness is incurred
or such preferred stock is issued would have been at least 2.0 to 1.0,
determined on a pro forma basis (including a pro forma application of the net
proceeds therefrom), as if the additional Indebtedness had been incurred, or the
preferred stock had been issued, as the case may be, at the beginning of such
four-quarter period.

          The provisions of the first paragraph of this Section 4.09 shall not
apply to the incurrence of any of the following items of Indebtedness
(collectively, "Permitted Debt"):

          (i) the incurrence by the Company of additional Indebtedness under
     Credit Facilities (and the guarantee thereof by the Guarantors) in an
     aggregate principal amount outstanding pursuant to this clause (i) at any
     one time (with letters of credit being deemed to have a principal amount
     equal to the maximum potential liability of the Company and its Restricted
     Subsidiaries thereunder), including all Permitted Refinancing Indebtedness
     then outstanding incurred to refund, refinance or replace any other
     Indebtedness incurred pursuant to this clause (i), not to exceed $2,000.0
     million less the aggregate amount of all Net Proceeds of Asset Sales
     applied to repay any such Indebtedness pursuant to Section 4.10;

          (ii) the incurrence by the Company and its Restricted Subsidiaries of
     the Existing Indebtedness;

          (iii) the incurrence by the Company and the Guarantors of $1.0 billion
     in aggregate principal amount of each of the Notes and the Exchange Notes
     and the Subsidiary Guarantees thereof;

          (iv) the incurrence by the Company or any of its Restricted
     Subsidiaries of Indebtedness represented by Capital Lease Obligations,
     mortgage financings or purchase money obligations, in each case incurred
     for the purpose of financing all or any part of the purchase price or cost
     of construction or improvement of property, plant or equipment used in the
     business of the Company or such Restricted Subsidiary, in an aggregate
     principal amount, including all Permitted Refinancing Indebtedness then
     outstanding incurred to refund, refinance or replace any other Indebtedness
     incurred pursuant to this clause (iv), not to exceed 5% of the Consolidated
     Tangible Assets of the Company at any time outstanding;


                                       48



          (v) the incurrence by the Company or any of its Restricted
     Subsidiaries of Indebtedness in connection with the acquisition of assets
     or a new Restricted Subsidiary; provided that such Indebtedness was
     incurred by the prior owner of such assets or such Restricted Subsidiary
     prior to such acquisition by the Company or one of its Restricted
     Subsidiaries and was not incurred in connection with, or in contemplation
     of, such acquisition by the Company or one of its Restricted Subsidiaries;
     and provided further that the principal amount (or accreted value, as
     applicable) of such Indebtedness, together with any other outstanding
     Indebtedness incurred pursuant to this clause (v), does not exceed $250.0
     million;

          (vi) the incurrence by the Company or any of its Restricted
     Subsidiaries of Permitted Refinancing Indebtedness in exchange for, or the
     net proceeds of which are used to refund, refinance or replace,
     Indebtedness that was permitted by this Indenture to be incurred (other
     than intercompany Indebtedness or Indebtedness incurred pursuant to clause
     (i) above);

          (vii) Indebtedness incurred by the Company or any of its Restricted
     Subsidiaries constituting reimbursement obligations with respect to letters
     of credit issued in the ordinary course of business in respect of workers'
     compensation claims or self-insurance, or other Indebtedness with respect
     to reimbursement type obligations regarding workers' compensation claims;
     provided, however, that upon the drawing of such letters of credit or the
     incurrence of such Indebtedness, such obligations are reimbursed within 30
     days following such drawing or incurrence;

          (viii) Indebtedness arising from agreements of the Company or a
     Restricted Subsidiary providing for indemnification, adjustment of purchase
     price or similar obligations, in each case, incurred or assumed in
     connection with the disposition of any business, assets or a Subsidiary,
     other than guarantees of Indebtedness incurred by any Person acquiring all
     or any portion of such business, assets or a Subsidiary for the purpose of
     financing such acquisition; provided, however, that (A) such Indebtedness
     is not reflected on the balance sheet of the Company or any Restricted
     Subsidiary (contingent obligations referred to in a footnote to financial
     statements and not otherwise reflected on the balance sheet shall not be
     deemed to be reflected on such balance sheet for purposes of this clause
     (A)) and (B) the maximum assumable liability in respect of all such
     Indebtedness shall at no time exceed the gross proceeds including noncash
     proceeds (the fair market value of such noncash proceeds being measured at
     the time received and without giving effect to any subsequent changes in
     value) actually received by the Company and its Restricted Subsidiaries in
     connection with such disposition;

          (ix) the incurrence by the Company or any of its Restricted
     Subsidiaries of intercompany Indebtedness between or among the Company and
     any of its Restricted Subsidiaries; provided, however, that (A) if the
     Company is the obligor on such Indebtedness, such Indebtedness is expressly
     subordinated to the prior payment in full in cash of all Obligations with
     respect to the Notes and (B)(1) any subsequent issuance or transfer of
     Equity Interests that results in any such Indebtedness being held by a
     Person other than the Company or one of its Restricted Subsidiaries and (2)
     any sale or other transfer of any such Indebtedness to a Person that is not
     either the Company or one of its


                                       49



     Restricted Subsidiaries shall be deemed, in each case, to constitute an
     incurrence of such Indebtedness by the Company or such Restricted
     Subsidiary, as the case may be;

          (x) the incurrence by the Company or any Restricted Subsidiary of
     Hedging Obligations that are incurred for the purpose of (A) fixing,
     hedging or capping interest rate risk with respect to any floating rate
     Indebtedness that is permitted by the terms of this Indenture to be
     outstanding or (B) protecting the Company and its Restricted Subsidiaries
     against changes in currency exchange rates;

          (xi) the guarantee by the Company or any of the Guarantors of
     Indebtedness of the Company or a Restricted Subsidiary of the Company that
     was permitted to be incurred by another provision of this Section 4.09;

          (xii) the incurrence by the Company's Unrestricted Subsidiaries of
     Non-Recourse Debt, provided, however, that if any such Indebtedness ceases
     to be Non-Recourse Debt of an Unrestricted Subsidiary, such event shall be
     deemed to constitute an incurrence of Indebtedness by a Restricted
     Subsidiary of the Company that was not permitted by this clause (xii), and
     the issuance of preferred stock by Unrestricted Subsidiaries;

          (xiii) obligations in respect of performance and surety bonds and
     completion guarantees provided by the Company or any Restricted
     Subsidiaries in the ordinary course of business;

          (xiv) the incurrence by the Company or any of its Restricted
     Subsidiaries of additional Indebtedness in an aggregate principal amount
     (or accreted value, as applicable) at any time outstanding, including all
     Permitted Refinancing Indebtedness then outstanding incurred to refund,
     refinance or replace any other Indebtedness incurred pursuant to this
     clause (xiv), not to exceed $200.0 million; and

          (xv) the incurrence by Foreign Subsidiaries of additional Indebtedness
     in an aggregate principal amount (or accreted value, as applicable) at any
     time outstanding, including all Permitted Refinancing Indebtedness then
     outstanding incurred to refund, refinance or replace any other Indebtedness
     incurred pursuant to this clause (xv), not to exceed the greater of (a) 5%
     of such Foreign Subsidiaries' Consolidated Tangible Assets or (b) $250.0
     million.

          For purposes of determining compliance with this Section 4.09, in the
event that an item of Indebtedness meets the criteria of more than one of the
categories of Permitted Debt described in clauses (i) through (xv) above or is
entitled to be incurred pursuant to the first paragraph of this Section 4.09,
the Company shall, in its sole discretion, classify, or later reclassify, such
item of Indebtedness in any manner that complies with this covenant. Accrual of
interest, the accretion of accreted value and the payment of interest in the
form of additional Indebtedness shall not be deemed to be an incurrence of
Indebtedness for purposes of this Section 4.09.


                                       50



Section 4.10 Asset Sales.

          The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, consummate an Asset Sale unless (i) the Company or the
Restricted Subsidiary, as the case may be, receives consideration at the time of
such Asset Sale at least equal to the fair market value (evidenced by an
Officers' Certificate delivered to the Trustee which will include a resolution
of the Board of Directors with respect to such fair market value in the event
such Asset Sale involves aggregate consideration in excess of $50.0 million) of
the assets or Equity Interests issued or sold or otherwise disposed of and (ii)
at least 75% of the consideration therefor received by the Company or such
Restricted Subsidiary, as the case may be, consists of cash, Cash Equivalents
and/or Marketable Securities; provided, however, that (A) the amount of any
Senior Debt of the Company or such Restricted Subsidiary that is assumed by the
transferee in any such transaction and (B) any consideration received by the
Company or such Restricted Subsidiary, as the case may be, that consists of (1)
all or substantially all of the assets of one or more Similar Businesses, (2)
other long-term assets that are used or useful in one or more Similar Businesses
and (3) Permitted Securities shall be deemed to be cash for purposes of this
provision.

          Within 365 days after the receipt of any Net Proceeds from an Asset
Sale, the Company may apply such Net Proceeds, at its option, (i) to repay
Indebtedness under a Credit Facility, (ii) to the acquisition of Permitted
Securities, (iii) to the acquisition of all or substantially all of the assets
of one or more Similar Businesses, (iv) to the making of a capital expenditure
or (v) to the acquisition of other long-term assets in a Similar Business.
Pending the final application of any such Net Proceeds, the Company may
temporarily reduce Indebtedness under a Credit Facility or otherwise invest such
Net Proceeds in any manner that is not prohibited by this Indenture. Any Net
Proceeds from Asset Sales that are not applied or invested as provided in the
first sentence of this paragraph shall be deemed to constitute "Excess
Proceeds". When the aggregate amount of Excess Proceeds exceeds $25.0 million,
the Company will be required to make an offer to all Holders of the Notes (an
"Asset Sale Offer") and any other Indebtedness that ranks pari passu with the
Notes (including, without limitation, the 2002 Notes, the May 2003 Notes, the
December 2003 Notes and the November 2004 Notes) that, by its terms, requires
the Company to offer to repurchase such Indebtedness with such Excess Proceeds
to purchase the maximum principal amount of Notes and pari passu Indebtedness
that may be purchased out of such Excess Proceeds at an offer price in cash in
an amount equal to 100% of the principal amount thereof plus accrued and unpaid
interest thereon, if any, to the date of purchase, in accordance with the
procedures set forth in this Indenture. To the extent that the aggregate amount
of Notes or pari passu Indebtedness tendered pursuant to an Asset Sale Offer is
less than the Excess Proceeds, the Company may use any Excess Proceeds for
general corporate purposes. If the aggregate principal amount of Notes or pari
passu Indebtedness surrendered by Holders thereof exceeds the amount of Excess
Proceeds in an Asset Sale Offer, the Company shall repurchase such Indebtedness
on a pro rata basis and the Trustee shall select the Notes to be purchased on a
pro rata basis. Upon completion of such offer to purchase, the amount of Excess
Proceeds shall be reset at zero.


                                       51



Section 4.11 Transactions With Affiliates.

          The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, make any payment to, or sell, lease, transfer or otherwise
dispose of any of its properties or assets to, or purchase any property or
assets from, or enter into or make or amend any transaction, contract,
agreement, understanding, loan, advance or guarantee with, or for the benefit
of, any Affiliate (each of the foregoing, an "Affiliate Transaction"), unless
(i) such Affiliate Transaction is on terms that are no less favorable to the
Company or the relevant Restricted Subsidiary than those that would have been
obtained in a comparable transaction by the Company or such Restricted
Subsidiary with an unrelated Person and (ii) the Company delivers to the Trustee
(A) with respect to any Affiliate Transaction or series of related Affiliate
Transactions involving aggregate consideration in excess of $20.0 million, a
resolution of the Board of Directors set forth in an Officers' Certificate
certifying that such Affiliate Transaction complies with clause (i) above and
that such Affiliate Transaction has been approved by a majority of the
disinterested members of the Board of Directors and (B) with respect to any
Affiliate Transaction or series of related Affiliate Transactions involving
aggregate consideration in excess of $50.0 million, an opinion as to the
fairness to the Holders of such Affiliate Transaction from a financial point of
view issued by an accounting, appraisal or investment banking firm of national
standing.

          The foregoing provisions shall not prohibit: (i) any employment or
indemnity agreement entered into by the Company or any of its Restricted
Subsidiaries in the ordinary course of business; (ii) any transaction with a
Lehman Investor; (iii) any transaction between or among the Company and/or its
Restricted Subsidiaries; (iv) transactions between the Company or any of its
Restricted Subsidiaries, on the one hand, and a Permitted Joint Venture, on the
other hand, on terms that are not materially less favorable to the Company or
the applicable Restricted Subsidiary of the Company than those that could have
been obtained from an unaffiliated third party; provided that (A) in the case of
any such transaction or series of related transactions pursuant to this clause
(iv) involving aggregate consideration in excess of $10.0 million but less than
$50.0 million, such transaction or series of transactions (or the agreement
pursuant to which the transactions were executed) was approved by the Company's
Chief Executive Officer or Chief Financial Officer and (B) in the case of any
such transaction or series of related transactions pursuant to this clause (iv)
involving aggregate consideration equal to or in excess of $50.0 million, such
transaction or series of related transactions (or the agreement pursuant to
which the transactions were executed) was approved by a majority of the
disinterested members of the Board of Directors; (v) any transaction pursuant to
and in accordance with the provisions of the Transaction Documents as the same
are in effect on the date of this Indenture; and (vi) any Restricted Payment
that is permitted by the provisions of Section 4.07.

Section 4.12 Liens.

          The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, directly or indirectly, create, incur, assume or suffer to
exist any Lien (other than Permitted Liens) securing Indebtedness on any asset
now owned or hereafter acquired, or any income or profits therefrom or assign or
convey any right to receive income therefrom, unless all payments due under this
Indenture and the Notes are secured on an equal and ratable basis with the
Obligations so secured until such time as such Obligations are no longer secured
by a Lien.


                                       52



Section 4.13 Future Subsidiary Guarantees.

          If the Company or any of its Subsidiaries shall acquire or create a
Subsidiary (other than a Foreign Subsidiary or an Unrestricted Subsidiary) after
the date of this Indenture, and such Subsidiary guarantees any other
Indebtedness of the Company or any of its Restricted Subsidiaries, then such
Subsidiary shall execute a Subsidiary Guarantee, in the form of the Supplemental
Indenture attached hereto as Exhibit E, and the Form of Notation on Senior
Subordinated Note, attached hereto as Exhibit F, and deliver an opinion of
counsel as to the validity of such Subsidiary Guarantee, in accordance with the
terms of this Indenture. The Subsidiary Guarantee of each Guarantor will rank
pari passu with the guarantees of the 2002 Notes, the May 2003 Notes, the
December 2003 Notes, the November 2004 Notes and the Convertible Notes and will
be subordinated to the prior payment in full of all Senior Debt of such
Guarantor, which would include the guarantees of amounts borrowed under the
Senior Credit Facility. The obligations of each Guarantor under its Subsidiary
Guarantee will be limited so as not to constitute a fraudulent conveyance under
applicable law.

          No Guarantor may consolidate with or merge with or into (whether or
not such Guarantor is the surviving Person) another Person (except the Company
or another Guarantor) unless (i) subject to the provisions of the following
paragraph, the Person formed by or surviving any such consolidation or merger
(if other than such Guarantor) or to which such sale, assignment, transfer,
lease, conveyance or other disposition shall have been made assumes all the
obligations of such Guarantor pursuant to a supplemental indenture in form and
substance reasonably satisfactory to the Trustee, under the Notes and this
Indenture; (ii) immediately after giving effect to such transaction, no Default
or Event of Default exists; and (iii) the Company (A) would be permitted by
virtue of the Company's pro forma Fixed Charge Coverage Ratio, immediately after
giving effect to such transaction, to incur at least $1.00 of additional
Indebtedness pursuant to the Fixed Charge Coverage Ratio test set forth in
Section 4.09 or (B) would have a pro forma Fixed Charge Coverage Ratio that is
greater than the actual Fixed Charge Coverage Ratio for the same four-quarter
period without giving pro forma effect to such transaction.

          Notwithstanding the foregoing clause (iii), (i) any Guarantor may
consolidate with, merge into or transfer all or part of its properties and
assets to the Company or to another Guarantor and (ii) any Guarantor may merge
with an Affiliate that has no significant assets or liabilities and was
incorporated solely for the purpose of reincorporating such Guarantor in another
State of the United States so long as the amount of Indebtedness of the Company
and its Restricted Subsidiaries is not increased thereby.

          In the event of a sale or other disposition of all of the assets of
any Guarantor, by way of merger, consolidation or otherwise, or a sale or other
disposition of all of the capital stock of any Guarantor, then such Guarantor
(in the event of a sale or other disposition, by way of such a merger,
consolidation or otherwise, of all of the capital stock of such Guarantor) or
the corporation acquiring the property (in the event of a sale or other
disposition of all of the assets of such Guarantor) will be released and
relieved of any obligations under its Subsidiary Guarantee; provided that the
Net Proceeds of such sale or other disposition are applied in accordance with
the applicable provisions of Section 4.10 (it being understood that only such
portion of the Net Proceeds as is required to be applied on or before the date
of such sale or other


                                       53



disposition in accordance with the terms of this Indenture needs to be applied
in accordance therewith at such time).

          The foregoing notwithstanding, a Subsidiary Guarantor will be
automatically and unconditionally released and discharged from all of its
obligations under this Indenture and its Subsidiary Guarantee if (a) such
Subsidiary is released from its Guarantees of, and all pledges and security
interests granted in connection with, all other Indebtedness of the Company or
any of their Restricted Subsidiaries or (b) the Company designates such
Subsidiary as an Unrestricted Subsidiary and such designation complies with the
other applicable provisions of the Indenture.

Section 4.14 Corporate Existence.

          Subject to Article 5 hereof, the Company shall do or cause to be done
all things necessary to preserve and keep in full force and effect (i) its
corporate existence, and the corporate, partnership or other existence of each
of its Restricted Subsidiaries, in accordance with the respective organizational
documents (as the same may be amended from time to time) of the Company or any
such Restricted Subsidiary and (ii) the rights (charter and statutory), licenses
and franchises of the Company and its Restricted Subsidiaries; provided,
however, that the Company shall not be required to preserve any such right,
license or franchise, or the corporate, partnership or other existence of any of
its Restricted Subsidiaries, if the Board of Directors shall determine that the
preservation thereof is no longer desirable in the conduct of the business of
the Company and its Restricted Subsidiaries, taken as a whole, and that the loss
thereof is not adverse in any material respect to the Holders of the Notes.

Section 4.15 Offer To Repurchase Upon Change Of Control.

          (a) Upon the occurrence of a Change of Control, each Holder of Notes
shall have the right to require the Company to repurchase all or any part (equal
to $100,000 or an integral multiple of $1,000 in excess thereof) of such
Holder's Notes pursuant to the offer described below (the "Change of Control
Offer") at an offer price in cash equal to 101% of the aggregate principal
amount thereof plus accrued and unpaid interest and Additional Interest thereon,
if any, to the date of purchase (the "Change of Control Payment"). Within ten
days following any Change of Control, the Company shall mail a notice to each
Holder describing the transaction or transactions that constitute the Change of
Control and offering to repurchase Notes on the date specified in such notice,
which date shall be no earlier than 30 days and no later than 60 days from the
date such notice is mailed (the "Change of Control Payment Date"). Such notice,
which shall govern the terms of the Change of Control offer, shall state: (i)
that the Change of Control Offer is being made pursuant to this Section 4.15 and
that all Notes tendered will be accepted for payment; (ii) the purchase price
and the purchase date; (iii) that any Note not tendered will continue to accrue
interest; (iv) that, unless the Company defaults in the payment of the Change of
Control Payment, all Notes accepted for payment pursuant to the Change of
Control Offer shall cease to accrue interest after the Change of Control Payment
Date; (v) that Holders electing to have any Notes purchased pursuant to a Change
of Control Offer will be required to surrender the Notes, with the form entitled
"Option of Holder to Elect Purchase" on the reverse of the Notes completed, to
the Paying Agent at the address specified in the notice prior to the close of
business on the third Business Day preceding the Change of Control Payment Date;
(vi) that Holders will be entitled to withdraw their election if the Paying
Agent


                                       54



receives, not later than the close of business on the second Business Day
preceding the Change of Control Payment Date, a telegram, telex, facsimile
transmission or letter setting forth the name of the Holder, the principal
amount of Notes delivered for purchase, and a statement that such Holder is
withdrawing his election to have the Notes purchased; and (vii) that Holders
whose Notes are being purchased only in part will be issued new Notes equal in
principal amount to the unpurchased portion of the Notes surrendered, which
unpurchased portion must be equal to $100,000 in principal amount or an integral
multiple of $1,000 in excess thereof. The Company shall comply with the
requirements of Rule 14e-1 under the Exchange Act and any other securities laws
and regulations thereunder to the extent such laws and regulations are
applicable in connection with the repurchase of Notes in connection with a
Change of Control.

          (b) On the Change of Control Payment Date, the Company shall, to the
extent lawful, (i) accept for payment all Notes or portions thereof properly
tendered pursuant to the Change of Control Offer, (ii) deposit with the Paying
Agent an amount equal to the Change of Control Payment in respect of all Notes
or portions thereof so tendered and (iii) deliver or cause to be delivered to
the Trustee the Notes so accepted together with an Officers' Certificate stating
the aggregate principal amount of Notes or portions thereof being purchased by
the Company. The Paying Agent shall promptly mail to each Holder of Notes so
tendered the Change of Control Payment for such Notes, and the Trustee shall
promptly authenticate and mail (or cause to be transferred by book entry) to
each Holder a new Note equal in principal amount to any unpurchased portion of
the Notes surrendered, if any; provided that each such new Note shall be in a
principal amount of $100,000 or an integral multiple of $1,000 in excess
thereof. Prior to mailing a Change of Control Offer, but in any event within 90
days following a Change of Control, the Company shall either repay all
outstanding Senior Debt or offer to repay all Senior Debt and terminate all
commitments thereunder of each lender who has accepted such offer or obtain the
requisite consents, if any, under all agreements governing outstanding Senior
Debt to permit the repurchase of Notes required by this Section 4.15. The
Company shall publicly announce the results of the Change of Control Offer on or
as soon as practicable after the Change of Control Payment Date.

Section 4.16 Anti-Layering; Subordination of Subsidiary Guarantees.

          The Company shall not incur, create, issue, assume, guarantee or
otherwise become liable for any Indebtedness that is subordinate or junior in
right of payment to any Senior Debt and senior in any respect in right of
payment to the Notes. No Guarantor shall incur, create, issue, assume, guarantee
or otherwise become liable for any Indebtedness that is subordinate or junior in
right of payment to any Senior Debt of a Guarantor and senior in any respect in
right of payment to any of the Subsidiary Guarantees. For purposes of the
foregoing, no Indebtedness will be deemed to be subordinated or junior in right
of payment to any other Indebtedness solely by virtue of being unsecured.

Section 4.17 Payments For Consent.

          Neither the Company nor any of its Subsidiaries shall, directly or
indirectly, pay or cause to be paid any consideration, whether by way of
interest, fee or otherwise, to any Holder of any Notes for or as an inducement
to any consent, waiver or amendment of any of the terms or provisions of this
Indenture or the Notes unless such consideration is offered to be paid or is
paid


                                       55



to all Holders of the Notes that consent, waive or agree to amend in the time
frame set forth in the solicitation documents relating to such consent, waiver
or agreement.

Section 4.18 Changes in Covenants when Notes Rated Investment Grade.

          If on any date following the date of this Indenture: (i) the Notes are
rated Baa3 or better by Moody's and BBB- or better by S&P (or, if either such
entity ceases to rate the Notes for reasons outside of the control of the
Company, the equivalent investment grade credit rating from any other
"nationally recognized statistical rating organization" within the meaning of
Rule 15c3-1(c)(2)(vi)(F) under the Exchange Act selected by Company as a
replacement agency) and (ii) no Default or Event of Default shall have occurred
and be continuing, then, beginning on that day and subject to the provisions of
the following paragraph, the provisions and covenants contained in Sections
4.07, 4.08, 4.09, 4.10, 4.11 and 4.17 hereof, clauses (iii)(A) and (B) of the
third paragraph of Section 4.13 hereof and clauses (iv)(A) and (B) of the first
paragraph of Section 5.01 hereof will no longer be in effect.

                                   ARTICLE 5.
                                   SUCCESSORS

Section 5.01 Merger, Consolidation, Or Sale Of Assets.

          The Company may not consolidate or merge with or into (whether or not
the Company is the surviving corporation), or sell, assign, transfer, lease,
convey or otherwise dispose of all or substantially all of its properties or
assets in one or more related transactions, to another Person unless (i) the
Company is the surviving corporation or the Person formed by or surviving any
such consolidation or merger (if other than the Company) or to which such sale,
assignment, transfer, lease, conveyance or other disposition shall have been
made is a corporation organized or existing under the laws of the United States,
any state thereof or the District of Columbia; (ii) the Person formed by or
surviving any such consolidation or merger (if other than the Company) or the
Person to which such sale, assignment, transfer, lease, conveyance or other
disposition shall have been made assumes all the obligations of the Company
under the Registration Rights Agreement, the Notes and this Indenture pursuant
to a supplemental indenture in a form reasonably satisfactory to the Trustee;
(iii) immediately after such transaction no Default or Event of Default exists;
and (iv) except in the case of a merger of the Company with or into a Wholly
Owned Restricted Subsidiary of the Company, the Company or the Person formed by
or surviving any such consolidation or merger (if other than the Company), or to
which such sale, assignment, transfer, lease, conveyance or other disposition
shall have been made, after giving pro forma effect to such transaction as if
such transaction had occurred at the beginning of the most recently ended four
full fiscal quarters for which internal financial statements are available
immediately preceding such transaction either: (A) would be permitted to incur
at least $1.00 of additional Indebtedness pursuant to the Fixed Charge Coverage
Ratio test set forth in the first paragraph of Section 4.09 or (B) would have a
pro forma Fixed Charge Coverage Ratio that is greater than the actual Fixed
Charge Coverage Ratio for the same four-quarter period without giving pro forma
effect to such transaction.

          Notwithstanding clause (iv) in the immediately foregoing paragraph,
(i) any Restricted Subsidiary may consolidate with, merge into or transfer all
or part of its properties and


                                       56



assets to the Company; and (ii) the Company may merge with an Affiliate that has
no significant assets or liabilities and was incorporated solely for the purpose
of reincorporating the Company in another State of the United States so long as
the amount of Indebtedness of the Company and its Restricted Subsidiaries is not
increased thereby.

Section 5.02 Successor Corporation Substituted.

          Upon any consolidation or merger, or any sale, assignment, transfer,
lease, conveyance or other disposition of all or substantially all of the assets
of the Company in accordance with Section 5.01 hereof, the successor corporation
formed by such consolidation or into or with which the Company is merged or to
which such sale, assignment, transfer, lease, conveyance or other disposition is
made shall succeed to, be substituted for (so that from and after the date of
such consolidation, merger, sale, lease, conveyance or other disposition, the
provisions of this Indenture referring to the "Company" shall refer instead to
the successor corporation and not to the Company), and may exercise every right
and power of, the Company under this Indenture with the same effect as if such
successor Person had been named as the Company herein; provided, however, that
the predecessor Company shall not be relieved from the obligation to pay the
principal of and interest on the Notes except in the case of a sale of all of
the Company's assets that meets the requirements of Section 5.01 hereof.

Section 5.03 Delivery of Officers' Certificate and Opinion of Counsel

          The Company shall deliver to the Trustee an Officers' Certificate and
Opinion of Counsel stating that any such consolidation, merger or sale complies
with the conditions set forth in this Article 5.

                                   ARTICLE 6.
                              DEFAULTS AND REMEDIES

Section 6.01 Events of Default.

          An "Event of Default" occurs if:

          (a) the Company defaults in the payment when due of interest on, or
     Additional Interest, if any, with respect to, the Notes and such default
     continues for a period of 30 days (whether or not prohibited by the
     subordination provisions of this Indenture);

          (b) the Company defaults in the payment when due of the principal of
     or premium, if any, on the Notes (whether or not prohibited by the
     subordination provisions of this Indenture);

          (c) the Company fails to comply with any of the provisions of Section
     4.10, 4.15, or 5.01 hereof;

          (d) the Company fails to observe or perform any other covenant or
     other agreement in this Indenture or the Notes for 60 days after notice to
     the Company by the


                                       57



     Trustee or the Holders of at least 25% in aggregate principal amount of the
     Notes then outstanding;

          (e) a default occurs under any mortgage, indenture or instrument under
     which there may be issued or by which there may be secured or evidenced any
     Indebtedness for money borrowed by the Company or any of its Restricted
     Subsidiaries (or the payment of which is guaranteed by the Company or any
     of its Restricted Subsidiaries), whether such Indebtedness or guarantee now
     exists, or is created after the date of this Indenture, which default
     results in the acceleration of such Indebtedness prior to its express
     maturity and, in each case, the principal amount of such Indebtedness,
     together with the principal amount of any other such Indebtedness, the
     maturity of which has been so accelerated, aggregates $50.0 million or
     more;

          (f) the Company or any of its Restricted Subsidiaries is subject to a
     final judgments aggregating in excess of $50.0 million, which judgments are
     not paid, discharged or stayed for a period of 60 days;

          (g) the Company or any of its Significant Subsidiaries or any group of
     Subsidiaries that, taken as a whole, would constitute a Significant
     Subsidiary pursuant to or within the meaning of Bankruptcy Law:

               (i) commences a voluntary case,

               (ii) consents to the entry of an order for relief against it in
          an involuntary case,

               (iii) consents to the appointment of a custodian of it or for all
          or substantially all of its property,

               (iv) makes a general assignment for the benefit of its creditors,
          or

               (v) generally is not paying its debts as they become due;

          (h) a court of competent jurisdiction enters an order or decree under
     any Bankruptcy Law that:

               (i) is for relief against the Company or any of its Significant
          Subsidiaries or any group of Subsidiaries that, taken as a whole,
          would constitute a Significant Subsidiary in an involuntary case;

               (ii) appoints a custodian of the Company or any of its
          Significant Subsidiaries or any group of Subsidiaries that, taken as a
          whole, would constitute a Significant Subsidiary or for all or
          substantially all of the property of the Company or any of its
          Significant Subsidiaries or any group of Subsidiaries that, taken as a
          whole, would constitute a Significant Subsidiary; or


                                       58



               (iii) orders the liquidation of the Company or any of its
          Significant Subsidiaries or any group of Subsidiaries that, taken as a
          whole, would constitute a Significant Subsidiary;

          and the order or decree remains unstayed and in effect for 60
          consecutive days; or

               (i) except as permitted herein, any Subsidiary Guarantee shall be
          held in any judicial proceeding to be unenforceable or invalid.

          The Holders of a majority in aggregate principal amount of the Notes
then outstanding by notice to the Trustee may on behalf of the Holders of all of
the Notes waive any existing Default or Event of Default and its consequences
under this Indenture except a continuing Default or Event of Default in the
payment of interest on, or the principal of, the Notes.

Section 6.02 Acceleration.

          If any Event of Default occurs and is continuing, the Trustee or the
Holders of at least 25% in principal amount of the then outstanding Notes may
declare all the Notes to be due and payable immediately; provided, however, that
so long as any Designated Senior Debt is outstanding, such declaration shall not
become effective until the earlier of (i) the day which is five Business Days
after receipt by the Representatives of Designated Senior Debt of such notice of
acceleration or (ii) the date of acceleration of any Designated Senior Debt.
Notwithstanding the foregoing, in the case of an Event of Default arising from
certain events of bankruptcy or insolvency, with respect to the Company or any
Significant Subsidiary or any group of Subsidiaries that, taken as a whole,
would constitute a Significant Subsidiary, all outstanding Notes will become due
and payable without further action or notice. Holders of the Notes may not
enforce this Indenture or the Notes except as provided in this Indenture.
Subject to certain limitations, Holders of a majority in principal amount of the
then outstanding Notes may direct the Trustee in its exercise of any trust or
power. The Trustee may withhold from Holders of the Notes notice of any
continuing Default or Event of Default (except a Default or Event of Default
relating to the payment of principal or interest) if it determines that
withholding notice is in their interest.

Section 6.03 Other Remedies.

          If an Event of Default occurs and is continuing, the Trustee may
pursue any available remedy to collect the payment of principal, premium, if
any, and interest on the Notes or to enforce the performance of any provision of
the Notes or this Indenture.

          The Trustee may maintain a proceeding even if it does not possess any
of the Notes or does not produce any of them in the proceeding. A delay or
omission by the Trustee or any Holder of a Note in exercising any right or
remedy accruing upon an Event of Default shall not impair the right or remedy or
constitute a waiver of or acquiescence in the Event of Default. All remedies are
cumulative to the extent permitted by law.


                                       59



Section 6.04 Waiver of Past Defaults.

          Holders of not less than a majority in aggregate principal amount of
the then outstanding Notes by notice to the Trustee may on behalf of the Holders
of all of the Notes waive an existing Default or Event of Default and its
consequences hereunder, except a continuing Default or Event of Default in the
payment of the principal of, premium or Additional Interest, if any, or interest
on, the Notes including in connection with an offer to purchase; provided,
however, that the Holders of a majority in aggregate principal amount at
maturity of the then outstanding Notes may rescind an acceleration and its
consequences, including any related payment default that resulted from such
acceleration. Upon any such waiver, such Default shall cease to exist, and any
Event of Default arising therefrom shall be deemed to have been cured for every
purpose of this Indenture; but no such waiver shall extend to any subsequent or
other Default or impair any right consequent thereon.

Section 6.05 Control By Majority.

          Holders of a majority in principal amount of the then outstanding
Notes may direct the time, method and place of conducting any proceeding for
exercising any remedy available to the Trustee or exercising any trust or power
conferred on it. However, the Trustee may refuse to follow any direction that
conflicts with law or this Indenture or that the Trustee determines may be
unduly prejudicial to the rights of other Holders of Notes or that may involve
the Trustee in personal liability.

Section 6.06 Limitation On Suits.

          A Holder of a Note may pursue a remedy with respect to this Indenture
or the Notes only if:

          (a) the Holder of a Note gives to the Trustee written notice of a
     continuing Event of Default;

          (b) the Holders of at least 25% in principal amount of the then
     outstanding Notes make a written request to the Trustee to pursue the
     remedy;

          (c) such Holder of a Note or Holders of Notes offer and, if requested,
     provide to the Trustee indemnity satisfactory to the Trustee against any
     loss, liability or expense;

          (d) the Trustee does not comply with the request within 60 days after
     receipt of the request and the offer and, if requested, the provision of
     indemnity; and

          (e) during such 60-day period the Holders of a majority in principal
     amount of the then outstanding Notes do not give the Trustee a direction
     inconsistent with the request.

A Holder of a Note may not use this Indenture to prejudice the rights of another
Holder of a Note or to obtain a preference or priority over another Holder of a
Note.


                                       60



Section 6.07 Rights of Holders of Notes to Receive Payment.

          Notwithstanding any other provision of this Indenture, the right of
any Holder of a Note to receive payment of principal, premium and Additional
Interest, if any, and interest on the Note, on or after the respective due dates
expressed in the Note (including in connection with an offer to purchase), or to
bring suit for the enforcement of any such payment on or after such respective
dates, shall not be impaired or affected without the consent of such Holder.

Section 6.08 Collection Suit by Trustee.

          If an Event of Default specified in Section 6.01(a) or (b) occurs and
is continuing, the Trustee is authorized to recover judgment in its own name and
as trustee of an express trust against the Company for the whole amount of
principal of, premium and Additional Interest, if any, and interest remaining
unpaid on the Notes and interest on overdue principal and, to the extent lawful,
interest and such further amount as shall be sufficient to cover the costs and
expenses of collection, including the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents and counsel.

Section 6.09 Trustee May File Proofs Of Claim.

          The Trustee is authorized to file such proofs of claim and other
papers or documents as may be necessary or advisable in order to have the claims
of the Trustee (including any claim for the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents and counsel) and the
Holders of the Notes allowed in any judicial proceedings relative to the Company
(or any other obligor upon the Notes), its creditors or its property and shall
be entitled and empowered to collect, receive and distribute any money or other
property payable or deliverable on any such claims and any custodian in any such
judicial proceeding is hereby authorized by each Holder to make such payments to
the Trustee, and in the event that the Trustee shall consent to the making of
such payments directly to the Holders, to pay to the Trustee any amount due to
it for the reasonable compensation, expenses, disbursements and advances of the
Trustee, its agents and counsel, and any other amounts due the Trustee under
Section 7.07 hereof. To the extent that the payment of any such compensation,
expenses, disbursements and advances of the Trustee, its agents and counsel, and
any other amounts due the Trustee under Section 7.07 hereof out of the estate in
any such proceeding, shall be denied for any reason, payment of the same shall
be secured by a Lien on, and shall be paid out of, any and all distributions,
dividends, money, securities and other properties that the Holders may be
entitled to receive in such proceeding whether in liquidation or under any plan
of reorganization or arrangement or otherwise. Nothing herein contained shall be
deemed to authorize the Trustee to authorize or consent to or accept or adopt on
behalf of any Holder any plan of reorganization, arrangement, adjustment or
composition affecting the Notes or the rights of any Holder, or to authorize the
Trustee to vote in respect of the claim of any Holder in any such proceeding.

Section 6.10 Priorities.

          If the Trustee collects any money pursuant to this Article, it shall
pay out the money in the following order:


                                       61



          First: to the Trustee, its agents and attorneys for amounts due under
     Section 7.07 hereof, including payment of all compensation, expense and
     liabilities incurred, and all advances made, by the Trustee and the costs
     and expenses of collection;

          Second: to Holders of Notes for amounts due and unpaid on the Notes
     for principal, premium and Additional Interest, if any, and interest,
     ratably, without preference or priority of any kind, according to the
     amounts due and payable on the Notes for principal, premium and Additional
     Interest, if any, and interest, respectively; and

          Third: to the Company or to such party as a court of competent
     jurisdiction shall direct.

          The Trustee may fix a record date and payment date for any payment to
Holders of Notes pursuant to this Section 6.10.

Section 6.11 Undertaking for Costs.

          In any suit for the enforcement of any right or remedy under this
Indenture or in any suit against the Trustee for any action taken or omitted by
it as a Trustee, a court in its discretion may require the filing by any party
litigant in the suit of an undertaking to pay the costs of the suit, and the
court in its discretion may assess reasonable costs, including reasonable
attorneys' fees, against any party litigant in the suit, having due regard to
the merits and good faith of the claims or defenses made by the party litigant.
This Section does not apply to a suit by the Trustee, a suit by a Holder of a
Note pursuant to Section 6.07 hereof, or a suit by Holders of more than 10% in
principal amount of the then outstanding Notes.

                                   ARTICLE 7.
                                     TRUSTEE

Section 7.01 Duties Of Trustee.

          (a) If an Event of Default has occurred and is continuing, the Trustee
shall exercise such of the rights and powers vested in it by this Indenture, and
use the same degree of care and skill in its exercise, as a prudent person would
exercise or use under the circumstances in the conduct of such person's affairs.

          (b) Except during the continuance of an Event of Default:

          (i) the duties of the Trustee shall be determined solely by the
     express provisions of this Indenture and the Trustee need perform only
     those duties that are specifically set forth in this Indenture and no
     others, and no implied covenants or obligations shall be read into this
     Indenture against the Trustee; and

          (ii) in the absence of bad faith or negligence on its part, the
     Trustee may conclusively rely, as to the truth of the statements and the
     correctness of the opinions expressed therein, upon certificates or
     opinions furnished to the Trustee and conforming to the requirements of
     this Indenture. However, in the case of any such certificates or opinions
     which by any provision hereof are specifically required to be furnished to
     the


                                       62



     Trustee, the Trustee shall examine the certificates and opinions to
     determine whether or not they conform to the requirements of this Indenture
     (but need not confirm or investigate the accuracy of mathematical
     calculations or other facts stated therein).

          (c) The Trustee may not be relieved from liabilities for its own
negligent action, its own negligent failure to act, or its own willful
misconduct, except that:

          (i) this paragraph does not limit the effect of paragraph (b) of this
     Section;

          (ii) the Trustee shall not be liable for any error of judgment made in
     good faith by a Responsible Officer, unless it is proved that the Trustee
     was negligent in ascertaining the pertinent facts; and

          (iii) the Trustee shall not be liable with respect to any action it
     takes or omits to take in good faith in accordance with a direction
     received by it pursuant to Section 6.05 hereof.

          (d) Whether or not therein expressly so provided, every provision of
this Indenture that in any way relates to the Trustee is subject to paragraphs
(a), (b), and (c) of this Section.

          (e) No provision of this Indenture shall require the Trustee to expend
or risk its own funds or incur any liability. The Trustee shall be under no
obligation to exercise any of its rights and powers under this Indenture at the
request of any Holders, unless such Holder shall have offered to the Trustee
security and indemnity satisfactory to it against any loss, liability or
expense.

          (f) The Trustee shall not be liable for interest on any money received
by it except as the Trustee may agree in writing with the Company. Money held in
trust by the Trustee need not be segregated from other funds except to the
extent required by law.

Section 7.02 Rights Of Trustee.

          (a) The Trustee may conclusively rely upon any document believed by it
to be genuine and to have been signed or presented by the proper Person. The
Trustee need not investigate any fact or matter stated in such document.

          (b) Before the Trustee acts or refrains from acting, it may require an
Officers' Certificate or an Opinion of Counsel or both. The Trustee shall not be
liable for any action it takes or omits to take in good faith in reliance on
such Officers' Certificate or Opinion of Counsel. The Trustee may consult with
counsel and the advice of such counsel or any Opinion of Counsel shall be full
and complete authorization and protection from liability in respect of any
action taken, suffered or omitted by it hereunder in good faith and in reliance
thereon.

          (c) The Trustee may act through its attorneys and agents and shall not
be responsible for the misconduct or negligence of any agent appointed with due
care.


                                       63



          (d) The Trustee shall not be liable for any action it takes or omits
to take in good faith that it believes to be authorized or within the rights or
powers conferred upon it by this Indenture.

          (e) Unless otherwise specifically provided in this Indenture, any
demand, request, direction or notice from the Company shall be sufficient if
signed by an Officer of the Company.

          (f) The Trustee shall be under no obligation to exercise any of the
rights or powers vested in it by this Indenture at the request or direction of
any of the Holders unless such Holders shall have offered to the Trustee
reasonable security or indemnity against the costs, expenses and liabilities
that might be incurred by it in compliance with such request or direction.

          (g) The Trustee may execute any of the trusts or powers hereunder or
perform any duties hereunder either directly or by or through agents or
attorneys and the Trustee shall not be responsible for any misconduct or
negligence on the part of any agent or attorney appointed with due care by it
hereunder.

          (h) The Trustee shall not be deemed to have notice of any Default or
Event of Default unless a Responsible Officer of the Trustee has actual
knowledge thereof or unless written notice of any event which is in fact such a
default is received by the Trustee at the Corporate Trust Office of the Trustee,
and such notice references the Notes and this Indenture.

          (i) Money held by the Trustee in trust hereunder need not be
segregated from other funds except to the extent required by law. The Trustee
shall be under no liability for interest on any money received by it hereunder
except as otherwise agreed in writing with the Company.

          (j) The rights, privileges, protections, immunities and benefits given
to the Trustee, including, without limitation, its right to be indemnified, are
extended to, and shall be enforceable by, the Trustee in each of its capacities
hereunder, and to each agent, custodian and other Person employed to act
hereunder.

          (k) The Trustee may request that the Company deliver an Officers'
Certificate setting forth the names of individuals and/or titles of officers
authorized at such time to take specified actions pursuant to this Indenture,
which Officers' Certificate may be signed by any person authorized to sign an
Officers' Certificate, including any person specified as so authorized in any
such certificate previously delivered send not superseded.

          (l) In no event shall the Trustee be responsible or liable for any
failure or delay in the performance of its obligations hereunder arising out of
or caused by, directly or indirectly, forces beyond its control, including
without limitation, strikes, work stoppages, accidents, acts of war or
terrorism, civil or military disturbances, nuclear or natural catastrophes or
acts of God, and interruptions, loss or malfunctions of utilities,
communications or computer (software and hardware) services; it being understood
that the Trustee shall use reasonable efforts which are consistent with accepted
practices in the banking industry to resume performance as soon as practicable
under the circumstances.


                                       64



Section 7.03 Individual Rights of Trustee.

          The Trustee in its individual or any other capacity may become the
owner or pledgee of Notes and may otherwise deal with the Company or any
Affiliate of the Company with the same rights it would have if it were not
Trustee. However, in the event that the Trustee acquires any conflicting
interest it must eliminate such conflict within 90 days, apply to the SEC for
permission to continue as trustee or resign. Any Agent may do the same with like
rights and duties. The Trustee is also subject to Sections 7.10 and 7.11 hereof.

Section 7.04 Trustee's Disclaimers.

          The Trustee shall not be responsible for and makes no representation
as to the validity or adequacy of this Indenture or the Notes, it shall not be
accountable for the Company's use of the proceeds from the Notes or any money
paid to the Company or upon the Company's direction under any provision of this
Indenture, it shall not be responsible for the use or application of any money
received by any Paying Agent other than the Trustee, and it shall not be
responsible for any statement or recital herein or any statement in the Notes or
any other document in connection with the sale of the Notes or pursuant to this
Indenture other than its certificate of authentication.

Section 7.05 Notice of Defaults.

          If a Default or Event of Default occurs and is continuing and if it is
known to the Trustee, the Trustee shall mail to Holders of Notes a notice of the
Default or Event of Default within 90 days after it occurs. Except in the case
of a Default or Event of Default in payment of principal of, premium, if any, or
interest on any Note, the Trustee may withhold the notice if and so long as a
committee of its Responsible Officers in good faith determines that withholding
the notice is in the interests of the Holders of the Notes.

Section 7.06 Reports by Trustee to Holders of the Notes.

          Within 60 days after each May 15 beginning with the May 15 following
the date of this Indenture, and for so long as Notes remain outstanding, the
Trustee shall mail to the Holders of the Notes a brief report dated as of such
reporting date that complies with TIA Section 313(a) (but if no event described
in TIA Section 313(a) has occurred within the twelve months preceding the
reporting date, no report need be transmitted). The Trustee also shall comply
with TIA Section 313(b)(2). The Trustee shall also transmit by mail all reports
as required by TIA Section 313(c).

          A copy of each report at the time of its mailing to the Holders of
Notes shall be mailed to the Company and filed with the SEC and each stock
exchange on which the Notes are listed in accordance with TIA Section 313(d).
The Company shall promptly notify the Trustee when the Notes are listed on any
stock exchange.

Section 7.07 Compensation and Indemnity.

          The Company shall pay to the Trustee from time to time such
compensation as the Company and the Trustee shall from time to time agree in
writing for its acceptance of this Indenture and services hereunder. The
Trustee's compensation shall not be limited by any law on


                                       65



compensation of a trustee of an express trust. The Company shall reimburse the
Trustee promptly upon request for all reasonable disbursements, advances and
expenses incurred or made by it in addition to the compensation for its
services. Such expenses shall include the reasonable compensation, disbursements
and expenses of the Trustee's agents and counsel.

          The Company shall indemnify the Trustee or any predecessor Trustee
against any and all losses, liabilities or expenses, including taxes (except for
taxes based upon the income of the Trustee), incurred by it arising out of or in
connection with the acceptance or administration of its duties under this
Indenture, including the costs and expenses of enforcing this Indenture against
the Company (including this Section 7.07) and defending itself against any claim
(whether asserted by the Company or any Holder or any other person) or liability
in connection with the exercise or performance of any of its powers or duties
hereunder, except to the extent any such loss, liability or expense may be
attributable to its negligence or bad faith. The Trustee shall notify the
Company promptly of any claim for which it may seek indemnity. Failure by the
Trustee to so notify the Company shall not relieve the Company of its
obligations hereunder. The Company shall defend the claim and the Trustee shall
cooperate in the defense. The Trustee may have separate counsel and the Company
shall pay the reasonable fees and expenses of such counsel. The Company need not
pay for any settlement made without its consent, which consent shall not be
unreasonably withheld.

          The obligations of the Company under this Section 7.07 shall survive
the satisfaction and discharge of this Indenture and the resignation or removal
of the Trustee.

          When the Trustee incurs expenses or renders services after an Event of
Default specified in Section 6.01(g) or (h) hereof occurs, the expenses and the
compensation for the services (including the fees and expenses of its agents and
counsel) are intended to constitute expenses of administration under any
Bankruptcy Law.

          The Trustee shall comply with the provisions of TIA Section 313(b)(2)
to the extent applicable.

Section 7.08 Replacement of Trustee.

          A resignation or removal of the Trustee and appointment of a successor
Trustee shall become effective only upon the successor Trustee's acceptance of
appointment as provided in this Section.

          The Trustee may resign in writing at any time and be discharged from
the trust hereby created by so notifying the Company. The Holders of Notes of a
majority in principal amount of the then outstanding Notes may remove the
Trustee by so notifying the Trustee and the Company in writing. The Company may
remove the Trustee if:

          (a) the Trustee fails to comply with Section 7.10 hereof;

          (b) the Trustee is adjudged a bankrupt or an insolvent or an order for
     relief is entered with respect to the Trustee under any Bankruptcy Law;

          (c) a custodian or public officer takes charge of the Trustee or its
     property; or


                                       66



          (d) the Trustee becomes incapable of acting.

          If the Trustee resigns or is removed or if a vacancy exists in the
office of Trustee for any reason, the Company shall promptly appoint a successor
Trustee. Within one year after the successor Trustee takes office, the Holders
of a majority in principal amount of the then outstanding Notes may appoint a
successor Trustee to replace the successor Trustee appointed by the Company.

          If a successor Trustee does not take office within 30 days after the
retiring Trustee resigns or is removed, the retiring Trustee (at the Company's
expense), the Company, or the Holders of Notes of at least 10% in principal
amount of the then outstanding Notes may petition any court of competent
jurisdiction for the appointment of a successor Trustee.

          If the Trustee, after written request by any Holder of a Note who has
been a Holder of a Note for at least six months, fails to comply with Section
7.10, such Holder of a Note may petition any court of competent jurisdiction for
the removal of the Trustee and the appointment of a successor Trustee.

          A successor Trustee shall deliver a written acceptance of its
appointment to the retiring Trustee and to the Company. Thereupon, the
resignation or removal of the retiring Trustee shall become effective, and the
successor Trustee shall have all the rights, powers and duties of the Trustee
under this Indenture. The successor Trustee shall mail a notice of its
succession to Holders of the Notes. The retiring Trustee shall promptly transfer
all property held by it as Trustee to the successor Trustee, provided all sums
owing to the Trustee hereunder have been paid and subject to the Lien provided
for in Section 7.07 hereof. Notwithstanding replacement of the Trustee pursuant
to this Section 7.08, the Company's obligations under Section 7.07 hereof shall
continue for the benefit of the retiring Trustee.

Section 7.09 Successor Trustee by Merger, Etc.

          If the Trustee consolidates, merges or converts into, or transfers all
or substantially all of its corporate trust business to, another corporation,
the successor corporation without any further act shall be the successor
Trustee.

Section 7.10 Eligibility; Disqualification.

          There shall at all times be a Trustee hereunder that is a corporation
organized and doing business under the laws of the United States of America or
of any state thereof that is authorized under such laws to exercise corporate
trustee power, that is subject to supervision or examination by federal or state
authorities and that has a combined capital and surplus of at least $50 million
as set forth in its most recent published annual report of condition.

          This Indenture shall always have a Trustee who satisfies the
requirements of TIA Section 310(a)(1), (2) and (5). The Trustee is subject to
TIA Section 310(b).


                                       67



Section 7.11 Preferential Collection of Claims Against Company.

          The Trustee is subject to TIA Section 311(a), excluding any creditor
relationship listed in TIA Section 311(b). A Trustee who has resigned or been
removed shall be subject to TIA Section 311(a) to the extent indicated therein.

                                   ARTICLE 8.
                    LEGAL DEFEASANCE AND COVENANT DEFEASANCE

Section 8.01 Option to Effect Legal Defeasance or Covenant Defeasance.

          The Company may, at the option of its Board of Directors evidenced by
a resolution set forth in an Officers' Certificate, at any time, elect to have
either Section 8.02 or 8.03 hereof be applied to all outstanding Notes upon
compliance with the conditions set forth below in this Article 8.

Section 8.02 Legal Defeasance and Discharge.

          Upon the Company's exercise under Section 8.01 hereof of the option
applicable to this Section 8.02, the Company shall, subject to the satisfaction
of the conditions set forth in Section 8.04 hereof, be deemed to have been
discharged from its obligations with respect to all outstanding Notes on the
date the conditions set forth below are satisfied (hereinafter, "Legal
Defeasance"). For this purpose, Legal Defeasance means that the Company shall be
deemed to have paid and discharged the entire Indebtedness represented by the
outstanding Notes, which shall thereafter be deemed to be "outstanding" only for
the purposes of Section 8.05 hereof and the other Sections of this Indenture
referred to in (a) and (b) below, and to have satisfied all its other
obligations under such Notes and this Indenture (and the Trustee, on demand of
and at the expense of the Company, shall execute proper instruments
acknowledging the same), except for the following provisions which shall survive
until otherwise terminated or discharged hereunder: (a) the rights of Holders of
outstanding Notes to receive solely from the trust fund described in Section
8.04 hereof, and as more fully set forth in such Section, payments in respect of
the principal of, premium and Additional Interest, if any, and interest on such
Notes when such payments are due, (b) the Company's obligations with respect to
such Notes under Sections 2.06, 2.07, 2.10 and 4.02 hereof, (c) the rights,
powers, trusts, duties and immunities of the Trustee hereunder and the Company's
obligations in connection therewith and (d) this Article 8. Subject to
compliance with this Article 8, the Company may exercise its option under this
Section 8.02 notwithstanding the prior exercise of its option under Section 8.03
hereof.

Section 8.03 Covenant Defeasance.

          Upon the Company's exercise under Section 8.01 hereof of the option
applicable to this Section 8.03, the Company shall, subject to the satisfaction
of the conditions set forth in Section 8.04 hereof, be released from its
obligations under Sections 4.03, 4.07, 4.08, 4.09, 4.10, 4.11, 4.12, 4.13, 4.15
and 4.16 and Article 5 hereof with respect to the outstanding Notes on and after
the date the conditions set forth below are satisfied (hereinafter, "Covenant
Defeasance"), and the Notes shall thereafter be deemed not "outstanding" for the
purposes of any direction, waiver, consent or declaration or act of Holders (and
the consequences of any thereof) in connection with such covenants, but shall
continue to be deemed "outstanding" for all other


                                       68



purposes hereunder (it being understood that such Notes shall not be deemed
outstanding for accounting purposes). For this purpose, Covenant Defeasance
means that, with respect to the outstanding Notes, the Company may omit to
comply with and shall have no liability in respect of any term, condition or
limitation set forth in any such covenant, whether directly or indirectly, by
reason of any reference elsewhere herein to any such covenant or by reason of
any reference in any such covenant to any other provision herein or in any other
document and such omission to comply shall not constitute a Default or an Event
of Default under Section 6.01 hereof, but, except as specified above, the
remainder of this Indenture and such Notes shall be unaffected thereby. In
addition, upon the Company's exercise under Section 8.01 hereof of the option
applicable to this Section 8.03 hereof, subject to the satisfaction of the
conditions set forth in Section 8.04 hereof, Sections 6.01(d) through 6.01(f)
hereof shall not constitute Events of Default.

Section 8.04 Conditions to Legal or Covenant Defeasance.

          The following shall be the conditions to the application of either
Section 8.02 or 8.03 hereof to the outstanding Notes:

          In order to exercise either Legal Defeasance or Covenant Defeasance:

          (a) the Company must irrevocably deposit with the Trustee, in trust,
     for the benefit of the Holders, cash in United States dollars, non-callable
     Government Securities, or a combination thereof, in such amounts as will be
     sufficient, in the opinion of a nationally recognized firm of independent
     public accountants, to pay the principal of, premium and Additional
     Interest, if any, and interest on the outstanding Notes on the stated date
     for payment thereof or on the applicable redemption date, as the case may
     be, and the Company must specify whether the Notes are being defeased to
     maturity or to a particular redemption date;

          (b) in the case of an election under Section 8.02 hereof, the Company
     shall have delivered to the Trustee an Opinion of Counsel in the United
     States reasonably acceptable to the Trustee confirming that (A) the Company
     has received from, or there has been published by, the Internal Revenue
     Service a ruling or (B) since the date of this Indenture, there has been a
     change in the applicable federal income tax law, in either case to the
     effect that, and based thereon such Opinion of Counsel shall confirm that,
     the Holders of the outstanding Notes will not recognize income, gain or
     loss for federal income tax purposes as a result of such Legal Defeasance
     and will be subject to federal income tax on the same amounts, in the same
     manner and at the same times as would have been the case if such Legal
     Defeasance had not occurred;

          (c) in the case of an election under Section 8.03 hereof, the Company
     shall have delivered to the Trustee an Opinion of Counsel in the United
     States reasonably acceptable to the Trustee confirming that the Holders of
     the outstanding Notes will not recognize income, gain or loss for federal
     income tax purposes as a result of such Covenant Defeasance and will be
     subject to federal income tax on the same amounts, in the same manner and
     at the same times as would have been the case if such Covenant Defeasance
     had not occurred;


                                       69



          (d) no Default or Event of Default shall have occurred and be
     continuing on the date of such deposit (other than a Default or Event of
     Default resulting from the incurrence of Indebtedness all or a portion of
     the proceeds of which will be used to defease the Notes pursuant to this
     Article 8 concurrently with such incurrence) or insofar as Sections 6.01(g)
     or 6.01(h) hereof is concerned, at any time in the period ending on the
     91st day after the date of deposit;

          (e) such Legal Defeasance or Covenant Defeasance shall not result in a
     breach or violation of, or constitute a default under, any material
     agreement or instrument (other than this Indenture) to which the Company or
     any of its Restricted Subsidiaries is a party or by which the Company or
     any of its Restricted Subsidiaries is bound;

          (f) the Company shall have delivered to the Trustee an opinion of
     counsel to the effect that on the 91st day following the deposit, the trust
     funds will not be subject to the effect of any applicable bankruptcy,
     insolvency, reorganization or similar laws affecting creditors' rights
     generally;

          (g) the Company shall have delivered to the Trustee an Officers'
     Certificate stating that the deposit was not made by the Company with the
     intent of preferring the Holders over any other creditors of the Company or
     with the intent of defeating, hindering, delaying or defrauding any other
     creditors of the Company; and

          (h) the Company shall have delivered to the Trustee an Officers'
     Certificate and an Opinion of Counsel, each stating that all conditions
     precedent provided for or relating to the Legal Defeasance or the Covenant
     Defeasance have been complied with.

Section 8.05 Deposited Money and Government Securities to be held in Trust;
Other Miscellaneous Provisions.

          Subject to Section 8.06 hereof, all money and non-callable Government
Securities (including the proceeds thereof) deposited with the Trustee (or other
qualifying trustee, collectively for purposes of this Section 8.05, the
"Trustee") pursuant to Section 8.04 hereof in respect of the outstanding Notes
shall be held in trust and applied by the Trustee, in accordance with the
provisions of such Notes and this Indenture, to the payment, either directly or
through any Paying Agent (including the Company acting as Paying Agent) as the
Trustee may determine, to the Holders of such Notes of all sums due and to
become due thereon in respect of principal, premium and Additional Interest, if
any, and interest, but such money need not be segregated from other funds except
to the extent required by law.

          The Company shall pay and indemnify the Trustee against any tax, fee
or other charge imposed on or assessed against the cash or non-callable
Government Securities deposited pursuant to Section 8.04 hereof or the principal
and interest received in respect thereof other than any such tax, fee or other
charge which by law is for the account of the Holders of the outstanding Notes.

          Anything in this Article 8 to the contrary notwithstanding, the
Trustee shall deliver or pay to the Company from time to time upon the request
of the Company any money or non-callable Government Securities held by it as
provided in Section 8.04 hereof which, in the


                                       70



opinion of a nationally recognized firm of independent public accountants
expressed in a written certification thereof delivered to the Trustee (which may
be the opinion delivered under Section 8.04(a) hereof), are in excess of the
amount thereof that would then be required to be deposited to effect an
equivalent Legal Defeasance or Covenant Defeasance.

Section 8.06 Repayment to Company.

          Any money deposited with the Trustee or any Paying Agent, or then held
by the Company, in trust for the payment of the principal of, premium and
Additional Interest, if any, or interest on any Note and remaining unclaimed for
two years after such principal, premium and Additional Interest, if any, or
interest has become due and payable shall be paid to the Company on its request
or (if then held by the Company) shall be discharged from such trust; and the
Holder of such Note shall thereafter, as a secured creditor, look only to the
Company for payment thereof, and all liability of the Trustee or such Paying
Agent with respect to such trust money, and all liability of the Company as
trustee thereof, shall thereupon cease; provided, however, that the Trustee or
such Paying Agent, before being required to make any such repayment, may at the
expense of the Company cause to be published once, in The New York Times and The
Wall Street Journal (national edition), notice that such money remains unclaimed
and that, after a date specified therein, which shall not be less than 30 days
from the date of such notification or publication, any unclaimed balance of such
money then remaining will be repaid to the Company.

Section 8.07 Reinstatement.

          If the Trustee or Paying Agent is unable to apply any United States
dollars or non-callable Government Securities in accordance with Section 8.02 or
8.03 hereof, as the case may be, by reason of any order or judgment of any court
or governmental authority enjoining, restraining or otherwise prohibiting such
application, then the Company's obligations under this Indenture and the Notes
shall be revived and reinstated as though no deposit had occurred pursuant to
Section 8.02 or 8.03 hereof until such time as the Trustee or Paying Agent is
permitted to apply all such money in accordance with Section 8.02 or 8.03
hereof, as the case may be; provided, however, that, if the Company makes any
payment of principal of, premium, if any, or interest on any Note following the
reinstatement of its obligations, the Company shall be subrogated to the rights
of the Holders of such Notes to receive such payment from the money held by the
Trustee or Paying Agent.

                                   ARTICLE 9.
                        AMENDMENT, SUPPLEMENT AND WAIVER

Section 9.01 Without Consent of Holders of Notes.

          Notwithstanding Section 9.02 of this Indenture, the Company and the
Trustee may amend or supplement this Indenture or the Notes without the consent
of any Holder of a Note:

          (a) to cure any ambiguity, defect or inconsistency;


                                       71



          (b) to provide for uncertificated Notes in addition to or in place of
     certificated Notes;

          (c) to provide for the assumption of the Company's obligations to the
     Holders of the Notes in the case of a merger or consolidation pursuant to
     Article 5 hereof;

          (d) to make any change that would provide any additional rights or
     benefits to the Holders of the Notes or that does not adversely affect the
     legal rights hereunder of any Holder of the Note;

          (e) to comply with requirements of the SEC in order to effect or
     maintain the qualification of this Indenture under the TIA; or

          (f) to conform the text of this Indenture or the Notes to any
     provision of the "Description of the Notes" section of the Company's
     Offering Memorandum, dated July 27, 2005, related to the initial offering
     of the Notes, to the extent that such provision in that "Description of the
     Notes" section was intended to be a verbatim recitation of a provision of
     this Indenture, the Subsidiary Guarantees or the Notes.

          Upon the request of the Company accompanied by a resolution of its
Board of Directors authorizing the execution of any such amended or supplemental
Indenture, and upon receipt by the Trustee of the documents described in Section
7.02 hereof, the Trustee shall join with the Company in the execution of any
amended or supplemental Indenture authorized or permitted by the terms of this
Indenture and to make any further appropriate agreements and stipulations that
may be therein contained, but the Trustee shall not be obligated to enter into
such amended or supplemental Indenture that affects its own rights, duties or
immunities under this Indenture or otherwise.

Section 9.02 With Consent of Holders of Notes.

          Except as provided below in this Section 9.02, the Company and the
Trustee may amend or supplement this Indenture (including Section 3.09, 4.10 and
4.15 hereof) and the Notes may be amended or supplemented with the consent of
the Holders of at least a majority in principal amount of the Notes then
outstanding (including consents obtained in connection with a tender offer or
exchange offer for the Notes), and, subject to Sections 6.04 and 6.07 hereof,
any existing Default or Event of Default (other than a Default or Event of
Default in the payment of the principal of, premium, if any, or interest on the
Notes, except a payment default resulting from an acceleration that has been
rescinded) or compliance with any provision of this Indenture or the Notes may
be waived with the consent of the Holders of a majority in principal amount of
the then outstanding Notes (including consents obtained in connection with a
tender offer or exchange offer for the Notes).

          Upon the request of the Company accompanied by a resolution of its
Board of Directors authorizing the execution of any such amended or supplemental
Indenture, and upon the filing with the Trustee of evidence satisfactory to the
Trustee of the consent of the Holders of Notes as aforesaid, and upon receipt by
the Trustee of the documents described in Section 7.02 hereof, the Trustee shall
join with the Company in the execution of such amended or supplemental Indenture
unless such amended or supplemental Indenture affects the Trustee's


                                       72



own rights, duties or immunities under this Indenture or otherwise, in which
case the Trustee may in its discretion, but shall not be obligated to, enter
into such amended or supplemental Indenture.

          The Company may, but shall not be obligated to, fix a record date for
the purpose of determining the Persons entitled to consent to any indenture
supplemental hereto. If a record date is fixed, the Holders on such record date,
or their duly designated proxies, and only such Persons, shall be entitled to
consent to such supplemental indenture, whether or not such Holders remain
Holders after such record date; provided, that unless such consent shall have
become effective by virtue of the requisite percentage having been obtained
prior to the date which is 180 days after such record date, any such consent
previously given shall automatically and without further action by any Holder be
canceled and of no further effect.

          It shall not be necessary for the consent of the Holders of Notes
under this Section 9.02 to approve the particular form of any proposed amendment
or waiver, but it shall be sufficient if such consent approves the substance
thereof.

          After an amendment, supplement or waiver under this Section becomes
effective, the Company shall mail to the Holders of Notes affected thereby a
notice briefly describing the amendment, supplement or waiver. Any failure of
the Company to mail such notice, or any defect therein, shall not, however, in
any way impair or affect the validity of any such amended or supplemental
Indenture or waiver. Subject to Sections 6.04 and 6.07 hereof, the Holders of a
majority in aggregate principal amount of the Notes then outstanding may waive
compliance in a particular instance by the Company with any provision of this
Indenture or the Notes. However, without the consent of each Holder affected, an
amendment or waiver may not (with respect to any Notes held by a non-consenting
Holder):

          (a) reduce the principal amount of Notes whose Holders must consent to
     an amendment, supplement or waiver;

          (b) reduce the principal of or change the fixed maturity of any Note
     or alter or waive any of the provisions with respect to the redemption of
     the Notes except as provided above with respect to Sections 4.10 and 4.15
     hereof;

          (c) reduce the rate of or change the time for payment of interest,
     including default interest, on any Note;

          (d) waive a Default or Event of Default in the payment of principal
     of, or premium and Additional Interest, if any, or interest on the Notes
     (except a rescission of acceleration of the Notes by the Holders of at
     least a majority in aggregate principal amount of the then outstanding
     Notes and a waiver of the payment default that resulted from such
     acceleration);

          (e) make any Note payable in money other than that stated in the
     Notes;

          (f) make any change in the provisions of this Indenture relating to
     waivers of past Defaults or the rights of Holders of Notes to receive
     payments of principal of or premium and Additional Interest, if any, or
     interest on the Notes;


                                       73



          (g) waive a redemption payment with respect to any Note (other than a
     payment required by Sections 3.09, 4.10 and 4.15 hereof); or

          (h) make any change in Section 6.04 or 6.07 hereof or in the foregoing
     amendment and waiver provisions.

Section 9.03 Compliance with Trust Indenture Act.

          Every amendment or supplement to this Indenture or the Notes shall be
set forth in a amended or supplemental Indenture that complies with the TIA as
then in effect.

Section 9.04 Revocation and Effect of Consents.

          Until an amendment, supplement or waiver becomes effective, a consent
to it by a Holder of a Note is a continuing consent by the Holder of a Note and
every subsequent Holder of a Note or portion of a Note that evidences the same
debt as the consenting Holder's Note, even if notation of the consent is not
made on any Note. However, any such Holder of a Note or subsequent Holder of a
Note may revoke the consent as to its Note if the Trustee receives written
notice of revocation before the date the waiver, supplement or amendment becomes
effective. An amendment, supplement or waiver becomes effective in accordance
with its terms and thereafter binds every Holder.

Section 9.05 Notation on or Exchange of Notes.

          The Trustee may place an appropriate notation about an amendment,
supplement or waiver on any Note thereafter authenticated. The Company in
exchange for all Notes may issue and the Trustee shall authenticate new Notes
that reflect the amendment, supplement or waiver.

          Failure to make the appropriate notation or issue a new Note shall not
affect the validity and effect of such amendment, supplement or waiver.

Section 9.06 Trustee to Sign Amendments, Etc.

          The Trustee shall sign any amended or supplemental Indenture
authorized pursuant to this Article 9 if the amendment or supplement does not
adversely affect the rights, duties, liabilities or immunities of the Trustee.
The Company may not sign an amendment or supplemental indenture until the Board
of Directors approves it. In executing any amended or supplemental indenture,
the Trustee shall be entitled to receive and (subject to Section 7.01) shall be
fully protected in relying upon, an Officers' Certificate and an Opinion of
Counsel stating that the execution of such amended or supplemental indenture is
authorized or permitted by this Indenture.


                                       74



                                   ARTICLE 10.
                              SUBSIDIARY GUARANTEES

Section 10.01 Agreement to Guarantee.

          Each of the Guarantors hereby agrees as follows:

          (a) Such Guarantor, jointly and severally with all other Guarantors,
unconditionally guarantees to each Holder of a Note authenticated and delivered
by the Trustee and to the Trustee its successors and assigns, regardless of the
validity and enforceability of this Indenture, the Notes or the Obligations of
the Company under this Indenture or the Notes, that:

          (i) the principal of, premium, interest and Additional Interest, if
     any, on the Notes will be promptly paid in full when due, whether at
     maturity, by acceleration, redemption or otherwise, and interest on the
     overdue principal of, premium, interest and Additional Interest, if any, on
     the Notes, to the extent lawful, and all other Obligations of the Company
     to the Holders or the Trustee thereunder or under this Indenture will be
     promptly paid in full, all in accordance with the terms thereof; and

          (ii) in case of any extension of time for payment or renewal of any
     Notes or any of such other Obligations, that the same will be promptly paid
     in full when due in accordance with the terms of the extension or renewal,
     whether at stated maturity, by acceleration or otherwise.

          (b) Notwithstanding the foregoing, in the event that this Guarantee
would constitute or result in a violation of any applicable fraudulent
conveyance or similar law of any relevant jurisdiction, the liability of the
Guarantors under this Indenture shall be reduced to the maximum amount
permissible under such fraudulent conveyance or similar law.

Section 10.02 Execution and Delivery of Subsidiary Guarantees.

          (a) To evidence its Subsidiary Guarantees set forth in this Indenture,
each Guarantor hereby agrees that a notation of such Guarantee substantially in
the form attached as Exhibit F to this Indenture shall be endorsed by an Officer
of such Guarantor on each Note authenticated and delivered by the Trustee on or
after the date hereof.

          (b) Notwithstanding the foregoing, each Guarantor hereby agrees that
its Guarantee set forth herein shall remain in full force and effect
notwithstanding any failure to endorse on each Note a notation of such
Guarantee.

          (c) If an Officer whose signature is on this Indenture no longer holds
that office at the time the Trustee authenticates the Note on which a Guarantee
is endorsed, the Guarantee shall be valid nevertheless.

          (d) The delivery of any Note by the Trustee, after the authentication
thereof under this Indenture, shall constitute due delivery of the Guarantee set
forth in this Indenture on behalf of each Guarantor.


                                       75



          (e) Each Guarantor hereby agrees that its obligations hereunder shall
be unconditional, regardless of the validity, regularity or enforceability of
the Notes or this Indenture, the absence of any action to enforce the same, any
waiver or consent by any Holder of the Notes with respect to any provisions
hereof or thereof, the recovery of any judgment against the Company, any action
to enforce the same or any other circumstance which might otherwise constitute a
legal or equitable discharge or defense of a guarantor.

          (f) Each Guarantor hereby waives diligence, presentment, demand of
payment, filing of claims with a court in the event of insolvency or bankruptcy
of the Company, any right to require a proceeding first against the Company,
protest, notice and all demands whatsoever and covenants that its Guarantee made
pursuant to this Indenture will not be discharged except by complete performance
of the obligations contained in the Notes and this Indenture.

          (g) If any Holder or the Trustee is required by any court or otherwise
to return to the Company or any Guarantor, or any custodian, Trustee, liquidator
or other similar official acting in relation to either the Company or such
Guarantor, any amount paid by either to the Trustee or such Holder, the
Guarantee made pursuant to this Indenture, to the extent theretofore discharged,
shall be reinstated in full force and effect.

          (h) Each Guarantor agrees that it shall not be entitled to any right
of subrogation in relation to the Holders in respect of any obligations
guaranteed hereby until payment in full of all obligations guaranteed hereby.
Each Guarantor further agrees that, as between such Guarantor, on the one hand,
and the Holders and the Trustee, on the other hand:

          (i) the maturity of the Obligations guaranteed hereby may be
     accelerated as provided in Article 6 of this Indenture for the purposes of
     the Guarantee made pursuant to this Indenture, notwithstanding any stay,
     injunction or other prohibition preventing such acceleration in respect of
     the obligations guaranteed hereby; and

          (ii) in the event of any declaration of acceleration of such
     Obligations as provided in Article 6 of this Indenture, such Obligations
     (whether or not due and payable) shall forthwith become due and payable by
     such Guarantor for the purpose of the Guarantee made pursuant to this
     Indenture.

          (i) Each Guarantor shall have the right to seek contribution from any
other non-paying Guarantor so long as the exercise of such right does not impair
the rights of the Holders or the Trustee under the Guarantee made pursuant to
this Indenture.

Section 10.03 Guarantors May Consolidate, Etc. on Certain Terms.

          (a) Except as set forth in Articles 4 and 5 of this Indenture, nothing
contained in this Indenture or in the Notes shall prevent any consolidation or
merger of any Guarantor with or into the Company or any other Guarantor or shall
prevent any transfer, sale or conveyance of the property of any Guarantor as an
entirety or substantially as an entirety, to the Company or any other Guarantor.


                                       76



          (b) Except as set forth in Articles 4 and 5 of this Indenture, nothing
contained in this Indenture or in the Notes shall prevent any consolidation or
merger of any Guarantor with or into a corporation or corporations other than
the Company or any other Guarantor (in each case, whether or not affiliated with
the Guarantor), or successive consolidations or mergers in which a Guarantor or
its successor or successors shall be a party or parties, or shall prevent any
sale or conveyance of the property of any Guarantor as an entirety or
substantially as an entirety, to a corporation other than the Company or any
other Guarantor (in each case, whether or not affiliated with the Guarantor)
authorized to acquire and operate the same; provided, however, that each
Guarantor hereby covenants and agrees that (i) subject to this Indenture, upon
any such consolidation, merger, sale or conveyance, the due and punctual
performance and observance of all of the covenants and conditions of this
Indenture to be performed by such Guarantor, shall be expressly assumed (in the
event that such Guarantor is not the surviving corporation in the merger), by
supplemental indenture satisfactory in form to the Trustee, executed and
delivered to the Trustee, by the corporation formed by such consolidation, or
into which such Guarantor shall have been merged, or by the corporation which
shall have acquired such property and (ii) immediately after giving effect to
such consolidation, merger, sale or conveyance no Default or Event of Default
exists.

          (c) In case of any such consolidation, merger, sale or conveyance and
upon the assumption by the successor corporation, by supplemental indenture,
executed and delivered to the Trustee and satisfactory in form to the Trustee,
of the Guarantee made pursuant to this Indenture and the due and punctual
performance of all of the covenants and conditions of this Indenture to be
performed by such Guarantor, such successor corporation shall succeed to and be
substituted for such Guarantor with the same effect as if it had been named
herein as one of the Guarantors. Such successor corporation thereupon may cause
to be signed any or all of the Guarantees to be endorsed upon the Notes issuable
under this Indenture which theretofore shall not have been signed by the Company
and delivered to the Trustee. All the Guarantees so issued shall in all respects
have the same legal rank and benefit under this Indenture as the Guarantees
theretofore and thereafter issued in accordance with the terms of this Indenture
as though all of such Guarantees had been issued at the date of the execution
hereof.

Section 10.04 Releases.

          (a) Concurrently with any sale of assets (including, if applicable,
all of the Capital Stock of a Guarantor), all Liens, if any, in favor of the
Trustee in the assets sold thereby shall be released; provided that in the event
of an Asset Sale, the Net Proceeds from such sale or other disposition are
treated in accordance with the provisions of Section 4.10 of this Indenture (it
being understood that only such portion of the Net Proceeds as is required to be
applied on or before the date of such sale or other disposition in accordance
with the terms of this Indenture needs to be applied in accordance therewith at
such time). If the assets sold in such sale or other disposition include all or
substantially all of the assets of a Guarantor or all of the Capital Stock of a
Guarantor, then the Guarantor (in the event of a sale or other disposition of
all of the Capital Stock of such Guarantor) or the Person acquiring the property
(in the event of a sale or other disposition of all or substantially all of the
assets of such Guarantor) shall be released from and relieved of its obligations
under this Indenture and its Guarantee made pursuant hereto; provided that in
the event of an Asset Sale, the Net Proceeds from such sale or other disposition
are treated in accordance with the provisions of Section 4.10 of this Indenture
(it being understood that only


                                       77



such portion of the Net Proceeds as is required to be applied on or before the
date of such sale or other disposition in accordance with the terms of this
Indenture needs to be applied in accordance therewith at such time). Upon
delivery by the Company to the Trustee of an Officers' Certificate to the effect
that such sale or other disposition was made by the Company or the Guarantor, as
the case may be, in accordance with the provisions of this Indenture, including,
without limitation, Section 4.10 of this Indenture, the Trustee shall execute
any documents reasonably required in order to evidence the release of the
Guarantor from its obligations under this Indenture and its Guarantee made
pursuant hereto. If the Guarantor is not released from its obligations under its
Guarantee, it shall remain liable for the full amount of principal of and
interest and Additional Interest, if any, on the Notes and for the other
obligations of such Guarantor under this Indenture.

          (b) Upon the designation of a Guarantor as an Unrestricted Subsidiary
in accordance with the terms of this Indenture or upon the release of a
Guarantor from its Guarantees of, and all pledges and security interests granted
in connection with, all other Indebtedness of the Company or any of their
Restricted Subsidiaries, such Guarantor shall be released and relieved of its
obligations under this Indenture. Upon delivery by the Company to the Trustee of
an Officers' Certificate and an Opinion of Counsel to the effect that such
designation of such Guarantor as an Unrestricted Subsidiary was made by the
Company in accordance with the provisions of this Indenture, including without
limitation Section 4.07 hereof, the Trustee shall execute any documents
reasonably required in order to evidence the release of such Guarantor from its
obligations under its Guarantee. Any Guarantor not released from its obligations
under its Guarantee shall remain liable for the full amount of principal of and
interest on the Notes and for the other obligations of any Guarantor under this
Indenture as provided in this Article 10.

          (c) Each Guarantor shall be released and relieved of its obligations
under this Indenture in accordance with, and subject to, Section 4.18 hereof.

Section 10.05 No Recourse Against Others.

          No past, present or future director, officer, employee, incorporator,
stockholder or agent of any Subsidiary of the Company, as such, shall have any
liability for any obligations of the Company or any Subsidiary of the Company
under the Notes, any Guarantees, this Indenture or for any claim based on, in
respect of, or by reason of, such obligations or their creation. Each Holder of
the Notes by accepting a Note waives and releases all such liability. The waiver
and release are part of the consideration for issuance of the Notes. Such waiver
may not be effective to waive liabilities under the federal securities laws and
it is the view of the Securities and Exchange Commission that such a waiver is
against public policy.

Section 10.06 Subordination of Subsidiary Guarantees

          The Guarantee of each Guarantor shall be subordinated to the prior
payment in full of all Senior Debt of that Guarantor (in the same manner and to
the same extent that the Notes are subordinated to Senior Debt), which shall
include all guarantees of Senior Debt.


                                       78



                                   ARTICLE 11.
                                  SUBORDINATION

Section 11.01 Agreement to Subordinate.

          The Company agrees, and each Holder by accepting a Note agrees, that
the Indebtedness evidenced by the Notes is subordinated in right of payment, to
the extent and in the manner provided in this Article 11, to the prior payment
in full in cash of all Senior Debt (whether outstanding on the date hereof or
hereafter created, incurred, assumed or guaranteed), and that the subordination
is for the benefit of the holders of Senior Debt.

Section 11.02 Liquidation; Dissolution; Bankruptcy.

          Upon any distribution to creditors of the Company in a liquidation or
dissolution of the Company, in a bankruptcy, reorganization, insolvency,
receivership or similar proceeding relating to the Company or its property, in
an assignment for the benefit of creditors or in any marshalling of the
Company's assets and liabilities, the holders of Senior Debt shall be entitled
to receive payment in full in cash of all Obligations due in respect of such
Senior Debt (including interest after the commencement of any such proceeding at
the rate specified in the applicable Senior Debt, whether or not an allowable
claim in any such proceeding) before the Holders of Notes will be entitled to
receive any payment with respect to the Notes, and until all Obligations with
respect to Senior Debt are paid in full in cash, any distribution to which the
Holders of Notes would be entitled shall be made to the holders of Senior Debt
(except, in each case, that Holders of Notes may receive Permitted Junior
Securities and payments made from the trust described under Article 8).

Section 11.03 Default on Designated Senior Debt.

          The Company may not make any payment or distribution to the Trustee or
any Holder in respect of Obligations with respect to the Notes and may not
acquire from the Trustee or any Holder any Notes for cash or property (other
than (i) securities that are subordinated to at least the same extent as the
Notes to (a) Senior Debt and (b) any securities issued in exchange for Senior
Debt and (ii) payments and other distributions made from any defeasance trust
created pursuant to Section 8.01 hereof) until all principal and other
Obligations with respect to the Senior Debt have been paid in full if:

          (i) a default in the payment of any principal or other Obligations
     with respect to Designated Senior Debt occurs and is continuing; or

          (ii) a default, other than a payment default, on Designated Senior
     Debt occurs and is continuing that then permits holders of the Designated
     Senior Debt as to which such default relates to accelerate its maturity (or
     that would permit such holders to accelerate with the giving of notice or
     the passage of time or both) and the Trustee receives a notice of the
     default (a "Payment Blockage Notice") from the Company or a Representative
     with respect to such Designated Senior Debt. If the Trustee receives any
     such Payment Blockage Notice, no subsequent Payment Blockage Notice shall
     be effective for purposes of this Section unless and until (i) at least 360
     days shall have elapsed since the effectiveness of the immediately prior
     Payment Blockage Notice and


                                       79



     (ii) all scheduled payments of principal, premium and Additional Interest,
     if any, and interest on the Notes that have come due have been paid in full
     in cash. No nonpayment default that existed or was continuing on the date
     of delivery of any Payment Blockage Notice to the Trustee shall be, or be
     made, the basis for a subsequent Payment Blockage Notice unless such
     default shall have been waived or cured for a period of not less than 90
     days.

          The Company may and shall resume payments on and distributions in
respect of the Notes and may acquire them upon the earlier of:

          (i) the date upon which the default is cured or waived, or

          (ii) in the case of a default referred to in Section 11.03(ii) hereof,
     179 days pass after the date on which the applicable Payment Blockage
     Notice is received if the maturity of such Designated Senior Debt has not
     been accelerated,

if this Article otherwise permits the payment, distribution or acquisition at
the time of such payment or acquisition.

Section 11.04 Acceleration of Securities.

          If payment of the Securities is accelerated because of an Event of
Default, the Company shall promptly notify holders of Senior Debt of the
acceleration.

Section 11.05 When Distribution Must Be Paid Over.

          In the event that the Trustee or any Holder receives any payment of
any Obligations with respect to the Notes at a time when the Trustee or such
Holder, as applicable, has actual knowledge that such payment is prohibited by
Article 11 hereof, such payment shall be held by the Trustee or such Holder, in
trust for the benefit of, and shall be paid forthwith over and delivered, upon
written request, to, the holders of Senior Debt as their interests may appear or
their Representative under the indenture or other agreement (if any) pursuant to
which Senior Debt may have been issued, as their respective interests may
appear, for application to the payment of all Obligations with respect to Senior
Debt remaining unpaid to the extent necessary to pay such Obligations in full in
accordance with their terms, after giving effect to any concurrent payment or
distribution to or for the holders of Senior Debt.

          With respect to the holders of Senior Debt, the Trustee undertakes to
perform only such obligations on the part of the Trustee as are specifically set
forth in this Article 11, and no implied covenants or obligations with respect
to the holders of Senior Debt shall be read into this Indenture against the
Trustee. The Trustee shall not be deemed to owe any fiduciary duty to the
holders of Senior Debt, and shall not be liable to any such holders if the
Trustee shall pay over or distribute to or on behalf of Holders or the Company
or any other Person money or assets to which any holders of Senior Debt shall be
entitled by virtue of this Article 11, except if such payment is made as a
result of the willful misconduct or negligence of the Trustee.


                                       80



Section 11.06 Notice by Company.

          The Company shall promptly notify the Trustee and the Paying Agent of
any facts known to the Company that would cause a payment of any Obligations
with respect to the Notes to violate this Article 11, but failure to give such
notice shall not affect the subordination of the Notes to the Senior Debt as
provided in this Article 11.

          The Trustee shall be entitled to rely on the delivery to it of a
written notice by a person representing himself to be a holder of Senior Debt
(or a trustee or agent on behalf of such holder) to establish that such notice
has been given by a holder of Senior Debt (or a trustee or agent on behalf of
any such holder). In the event that the Trustee determines in good faith that
further evidence is required with respect to the right of any person as holder
of Senior Debt to participate in any payment or distribution pursuant to this
Article 11, the Trustee may request such person to furnish evidence to the
reasonable satisfaction of the Trustee as to the amount of Senior Debt held by
such person, the extent to which such person is entitled to participate in such
evidence is not furnish, the Trustee may defer any payment which it may be
required to make for the benefit of such person pursuant to the terms of this
Indenture pending judicial determination as to the rights of such person to
receive such payment.

Section 11.07 Subrogation.

          After all Senior Debt is paid in full in cash and until the Notes are
paid in full, Holders of Notes shall be subrogated (equally and ratably with all
other Indebtedness pari passu with the Notes) to the rights of holders of Senior
Debt to receive distributions applicable to Senior Debt to the extent that
distributions otherwise payable to the Holders of Notes have been applied to the
payment of Senior Debt. A distribution made under this Article 11 to holders of
Senior Debt that otherwise would have been made to Holders of Notes is not, as
between the Company and Holders, a payment by the Company on the Notes.

Section 11.08 Relative Rights.

          This Article 11 defines the relative rights of Holders of Notes and
holders of Senior Debt. Nothing in this Indenture shall:

          (i) impair, as between the Company and Holders of Notes, the
     obligation of the Company, which is absolute and unconditional, to pay
     principal of and interest on the Notes in accordance with their terms;

          (ii) affect the relative rights of Holders of Notes and creditors of
     the Company other than their rights in relation to holders of Senior Debt;
     or

          (iii) prevent the Trustee or any Holder of Notes from exercising its
     available remedies upon a Default or Event of Default, subject to the
     rights of holders and owners of Senior Debt to receive distributions and
     payments otherwise payable to Holders of Notes.

          If the Company fails because of this Article 11 to pay principal of or
interest on a Note on the due date, the failure is still a Default or Event of
Default.


                                       81



Section 11.09 Subordination May Not Be Impaired by Company.

          No right of any holder of Senior Debt to enforce the subordination of
the Indebtedness evidenced by the Notes shall be impaired by any act or failure
to act by the Company or any Holder or by the failure of the Company or any
Holder to comply with this Indenture.

Section 11.10 Distribution or Notice to Representative.

          Whenever a distribution is to be made or a notice given to holders of
Senior Debt, the distribution may be made and the notice given to their
Representative.

          Upon any payment or distribution of assets of the Company referred to
in this Article 11, the Trustee and the Holders of Notes shall be entitled to
rely upon any order or decree made by any court of competent jurisdiction or
upon any certificate of such Representative or of the liquidating trustee or
agent or other Person making any distribution to the Trustee or to the Holders
of Notes for the purpose of ascertaining the Persons entitled to participate in
such distribution, the holders of the Senior Debt and other Indebtedness of the
Company, the amount thereof or payable thereon, the amount or amounts paid or
distributed thereon and all other facts pertinent thereto or to this Article 11.

Section 11.11 Rights of Trustee and Paying Agent.

          Notwithstanding the provisions of this Article 11 or any other
provision of this Indenture, the Trustee shall not be charged with knowledge of
the existence of any facts that would prohibit the making of any payment or
distribution by the Trustee, and the Trustee and the Paying Agent may continue
to make payments on the Notes, unless the Trustee shall have received at its
Corporate Trust Office at least three Business Days prior to the date of such
payment written notice of facts that would cause the payment of any Obligations
with respect to the Notes to violate this Article 11. Only the Company or a
Representative may give the notice. Nothing in this Article 11 shall impair the
claims of, or payments to, the Trustee under or pursuant to Section 7.07 hereof.

          The Trustee in its individual or any other capacity may hold Senior
Debt with the same rights it would have if it were not Trustee. Any Agent may do
the same with like rights. Nothing in this Article 11 shall apply to claims of,
or payments to, the Trustee under or pursuant to Section 7.07.

Section 11.12 Authorization to Effect Subordination.

          Each Holder of Notes, by the Holder's acceptance thereof, authorizes
and directs the Trustee on such Holder's behalf to take such action as may be
necessary or appropriate to effectuate the subordination as provided in this
Article 11, and appoints the Trustee to act as such Holder's attorney-in-fact
for any and all such purposes. If the Trustee does not file a proper proof of
claim or proof of debt in the form required in any proceeding referred to in
Section 6.09 hereof at least 30 days before the expiration of the time to file
such claim, the credit agents are hereby authorized to file an appropriate claim
for and on behalf of the Holders of the Notes.


                                       82



Section 11.13 Amendments.

          The provisions of this Article 11 shall not be amended or modified
without the written consent of the holders of at least 75% in aggregate
principal amount of the Notes then outstanding if such amendment would adversely
affect the rights of Holders of Notes.

                                   ARTICLE 12.
                                  MISCELLANEOUS

Section 12.01 Trust Indenture Act Controls.

          If any provision of this Indenture limits, qualifies or conflicts with
the duties imposed by TIA Section 318(c), the imposed duties shall control.

Section 12.02 Notices.

          Any notice or communication by the Company or the Trustee to the
others is duly given if in writing and delivered in Person or mailed by first
class mail (registered or certified, return receipt requested), telecopier or
overnight air courier guaranteeing next day delivery, to the others' address:

          If to the Company or any Guarantor:

          L-3 Communications Corporation
          600 Third Avenue, 34th Floor,
          New York, New York 10016
          Attention: Senior Vice President-Finance (Fax: 212-805-5440)

          With a copy to:

          Simpson Thacher & Bartlett LLP
          425 Lexington Avenue
          New York, New York 10017
          Attention: Vincent Pagano, Jr. (Fax: 212-455-2502)

          If to the Trustee:

          The Bank of New York
          101 Barclay Street
          New York, New York 10286
          Attention: Corporate Trust Administration (Fax: 212-815-5704)

          The Company or the Trustee, by notice to the others may designate
additional or different addresses for subsequent notices or communications.

          All notices and communications (other than those sent to Holders)
shall be deemed to have been duly given, at the time delivered by hand, if
personally delivered; five Business Days after being deposited in the mail,
postage prepaid, if mailed; when receipt


                                       83



acknowledged, if telecopied; and the next Business Day after timely delivery to
the courier, if sent by overnight air courier guaranteeing next day delivery.

          Any notice or communication to a Holder shall be mailed by first class
mail, certified or registered, return receipt requested, or by overnight air
courier guaranteeing next day delivery to its address shown on the register kept
by the Registrar. Any notice or communication shall also be so mailed to any
Person described in TIA Section 313(c), to the extent required by the TIA.
Failure to mail a notice or communication to a Holder or any defect in it shall
not affect its sufficiency with respect to other Holders.

          If a notice or communication is mailed in the manner provided above
within the time prescribed, it is duly given, whether or not the addressee
receives it.

          If the Company mails a notice or communication to Holders, it shall
mail a copy to the Trustee and each Agent at the same time.

Section 12.03 Communications By Holders of Notes with Other Holders of Notes.

          Holders may communicate pursuant to TIA Section 312(b) with other
Holders with respect to their rights under this Indenture or the Notes. The
Company, the Trustee, the Registrar and anyone else shall have the protection of
TIA Section 312(c).

Section 12.04 Certificate and Opinion as to Conditions Precedent.

          Upon any request or application by the Company to the Trustee to take
any action under this Indenture, the Company shall furnish to the Trustee:

          (a) an Officers' Certificate in form and substance reasonably
     satisfactory to the Trustee (which shall include the statements set forth
     in Section 12.05 hereof) stating that, in the opinion of the signers, all
     conditions precedent and covenants, if any, provided for in this Indenture
     relating to the proposed action have been satisfied; and

          (b) an Opinion of Counsel in form and substance reasonably
     satisfactory to the Trustee (which shall include the statements set forth
     in Section 12.05 hereof) stating that, in the opinion of such counsel, all
     such conditions precedent and covenants have been satisfied.

Section 12.05 Statements required in Certificate or Opinion.

          Each certificate or opinion with respect to compliance with a
condition or covenant provided for in this Indenture (other than a certificate
provided pursuant to TIA Section 314(a)(4)) shall comply with the provisions of
TIA Section 314(e) and shall include:

          (a) a statement that the Person making such certificate or opinion has
     read such covenant or condition;


                                       84



          (b) a brief statement as to the nature and scope of the examination or
     investigation upon which the statements or opinions contained in such
     certificate or opinion are based;

          (c) a statement that, in the opinion of such Person, he or she has
     made such examination or investigation as is necessary to enable him to
     express an informed opinion as to whether or not such covenant or condition
     has been satisfied; and

          (d) a statement as to whether or not, in the opinion of such Person,
     such condition or covenant has been satisfied.

Section 12.06 Rule by Trustee and Agents.

          The Trustee may make reasonable rules for action by or at a meeting of
Holders. The Registrar or Paying Agent may make reasonable rules and set
reasonable requirements for its functions.

Section 12.07 No Personal Liability of Directors, Officers, Employees and
Stockholders.

          No director, officer, employee, incorporator or stockholder of the
Company or any Subsidiary of the Company, as such, shall have any liability for
any obligations of the Company or any Subsidiary of the Company under the Notes
or the Subsidiary Guarantees and this Indenture or for any claim based on, in
respect of, or by reason of, such obligations or their creation. Each Holder of
Notes by accepting a Note waives and releases all such liability. The waiver and
release are part of the consideration for issuance of the Notes. Such waiver may
not be effective to waive liabilities under the federal securities laws and it
is the view of the SEC that such a waiver is against public policy.

Section 12.08 Governing Law.

          THIS INDENTURE, THE NOTES AND THE SUBSIDIARY GUARANTEES SHALL BE
GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW
YORK.

Section 12.09 No Adverse Interpretation of other Agreements.

          This Indenture may not be used to interpret any other indenture, loan
or debt agreement of the Company or its Subsidiaries or of any other Person. Any
such indenture, loan or debt agreement may not be used to interpret this
Indenture.

Section 12.10 Successors.

          All agreements of the Company in this Indenture and the Notes shall
bind its successors. All agreements of the Trustee in this Indenture shall bind
its successors.


                                       85



Section 12.11 Severability.

          In case any provision in this Indenture or in the Notes shall be
invalid, illegal or unenforceable, the validity, legality and enforceability of
the remaining provisions shall not in any way be affected or impaired thereby.

Section 12.12 Counterpart Originals.

          The parties may sign any number of copies of this Indenture. Each
signed copy shall be an original, but all of them together represent the same
agreement.

Section 12.13 Table of Contents, Headings, Etc.

          The Table of Contents, Cross-Reference Table and Headings of the
Articles and Sections of this Indenture have been inserted for convenience of
reference only, are not to be considered a part of this Indenture and shall in
no way modify or restrict any of the terms or provisions hereof.

                         [Signatures on following pages]


                                       86



                                   SIGNATURES

Dated as of July 29, 2005

                                        L-3 COMMUNICATIONS CORPORATION


                                        By: /s/ Michael T. Strianese
                                            ------------------------------------
                                            Name:  Michael T. Strianese
                                            Title:

GUARANTORS:

APCOM, INC.
BROADCAST SPORTS INC.
D.P. ASSOCIATES INC.
ELECTRODYNAMICS, INC.
HENSCHEL INC.
HYGIENETICS ENVIRONMENTAL SERVICES, INC.
INTERSTATE ELECTRONICS CORPORATION
KDI PRECISION PRODUCTS, INC.
L-3 COMMUNICATIONS AEROMET, INC.
L-3 COMMUNICATIONS VERTEX AEROSPACE LLC
L-3 COMMUNICATIONS ADVANCED LASER SYSTEMS TECHNOLOGY, INC.
L-3 COMMUNICATIONS AIS GP CORPORATION
L-3 COMMUNICATIONS AVIONICS SYSTEMS, INC.
L-3 COMMUNICATIONS AVISYS CORPORATION
L-3 COMMUNICATIONS CE HOLDINGS, INC.
L-3 COMMUNICATIONS CINCINNATI ELECTRONICS CORPORATION
L-3 COMMUNICATIONS CSI, INC.
L-3 COMMUNICATIONS AYDIN CORPORATION
L-3 COMMUNICATIONS ELECTRON TECHNOLOGIES, INC.
L-3 COMMUNICATIONS ESSCO, INC.
L-3 COMMUNICATIONS FLIGHT INTERNATIONAL AVIATION LLC
L-3 COMMUNICATIONS FLIGHT CAPITAL LLC
L-3 COMMUNICATIONS GOVERNMENT SERVICES, INC.
L-3 COMMUNICATIONS ILEX SYSTEMS, INC.
L-3 COMMUNICATIONS INFRARED VISION TECHNOLOGY CORPORATION
L-3 COMMUNICATIONS INVESTMENTS INC.
L-3 COMMUNICATIONS KLEIN ASSOCIATES, INC.
L-3 COMMUNICATIONS MAS (US) CORPORATION
L-3 COMMUNICATIONS MOBILE-VISION, INC.
L-3 COMMUNICATIONS SECURITY AND DETECTION SYSTEMS, INC.
L-3 COMMUNICATIONS SONOMA EO, INC.
L-3 COMMUNICATIONS VECTOR INTERNATIONAL AVIATION LLC
L-3 COMMUNICATIONS WESTWOOD CORPORATION
MCTI ACQUISITION CORPORATION
MICRODYNE COMMUNICATIONS TECHNOLOGIES INCORPORATED
MICRODYNE CORPORATION


                                       S-1



MICRODYNE OUTSOURCING INCORPORATED
MPRI, INC.
PAC ORD INC.
POWER PARAGON, INC.
SHIP ANALYTICS, INC.
SHIP ANALYTICS INTERNATIONAL, INC.
SHIP ANALYTICS USA, INC.
SPD ELECTRICAL SYSTEMS, INC.
SPD SWITCHGEAR INC.
SYCOLEMAN CORPORATION
TROLL TECHNOLOGY CORPORATION
WESCAM AIR OPS INC.
WESCAM AIR OPS LLC
WESCAM HOLDINGS (US) INC.
WESCAM INCORPORATED
WESCAM LLC
WOLF COACH, INC.,
   as Guarantors


By: /s/ Christopher C. Cambria
    ----------------------------------------
    Name: Christopher C. Cambria
    Title: Vice President and Secretary


L-3 COMMUNICATIONS INTEGRATED SYSTEMS L.P.
   as Guarantor

By: L-3 COMMUNICATIONS AIS GP CORPORATION,
        as General Partner


By: /s/ Christopher C. Cambria
    ----------------------------------------
    Name:  Christopher C. Cambria
    Title: Authorized Person


THE BANK OF NEW YORK,
   as Trustee


By: /s/ Kisha A. Holder
    ----------------------------------------
    Name:  Kisha A. Holder
    Title: Assistant Vice President


                                       S-2



                                                                       EXHIBIT A

                                 (Face of Note)
--------------------------------------------------------------------------------

                                                                     CUSIP _____

                    6 3/8% Senior Subordinated Notes due 2015

   No. ___                                                            $_________

                         L-3 COMMUNICATIONS CORPORATION

   promises to pay to __________________________________________________________

   or registered assigns,

   the principal sum of ________________________________________________________

   Dollars on October 15, 2015.

   Interest Payment Dates: April 15 and October 15.

   Record Dates: April 1 and October 1.

                                        Dated: July 29, 2005

                                        L-3 COMMUNICATIONS CORPORATION


                                        By:
                                            ------------------------------------
                                            Name:
                                            Title:


                                        By:
                                            ------------------------------------
                                            Name:
                                            Title:

This is one of the Global
Notes referred to in the
within-mentioned Indenture:

Dated: July 29, 2005

THE BANK OF NEW YORK,
   as Trustee


By:
    ---------------------------------
    Name:
    Title:

--------------------------------------------------------------------------------


                                       A-1



                                 (Back of Note)

                    6 3/8% Senior Subordinated Notes due 2015

THIS GLOBAL NOTE IS HELD BY THE DEPOSITARY (AS DEFINED IN THE INDENTURE
GOVERNING THIS NOTE) OR ITS NOMINEE IN CUSTODY FOR THE BENEFIT OF THE BENEFICIAL
OWNERS HEREOF, AND IS NOT TRANSFERABLE TO ANY PERSON UNDER ANY CIRCUMSTANCES
EXCEPT THAT (I) THE TRUSTEE MAY MAKE SUCH NOTATIONS HEREON AS MAY BE REQUIRED
PURSUANT TO SECTION 2.07 OF THE INDENTURE, (II) THIS GLOBAL NOTE MAY BE
EXCHANGED IN WHOLE BUT NOT IN PART PURSUANT TO SECTION 2.06(a) OF THE INDENTURE,
(III) THIS GLOBAL NOTE MAY BE DELIVERED TO THE TRUSTEE FOR CANCELLATION PURSUANT
TO SECTION 2.11 OF THE INDENTURE AND (IV) THIS GLOBAL NOTE MAY BE TRANSFERRED TO
A SUCCESSOR DEPOSITARY WITH THE PRIOR WRITTEN CONSENT OF L-3 COMMUNICATIONS
CORPORATION.(1)

THE SECURITY (OR ITS PREDECESSOR) EVIDENCED HEREBY WAS ORIGINALLY ISSUED IN A
TRANSACTION EXEMPT FROM REGISTRATION UNDER SECTION 5 OF THE UNITED STATES
SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"), AND THE SECURITY
EVIDENCED HEREBY MAY NOT BE OFFERED, SOLD OR OTHERWISE TRANSFERRED IN THE
ABSENCE OF SUCH REGISTRATION OR AN APPLICABLE EXEMPTION THEREFROM. EACH
PURCHASER OF THE SECURITY EVIDENCED HEREBY IS HEREBY NOTIFIED THAT THE SELLER
MAY BE RELYING ON THE EXEMPTION FROM THE PROVISION OF SECTION 5 OF THE
SECURITIES ACT PROVIDED BY RULE 144A THEREUNDER. THE HOLDER OF THE SECURITY
EVIDENCED HEREBY AGREES FOR THE BENEFIT OF L-3 COMMUNICATIONS CORPORATION THAT
(A) SUCH SECURITY MAY BE RESOLD, PLEDGED OR OTHERWISE TRANSFERRED, ONLY (1) (a)
TO A PERSON WHOM THE SELLER REASONABLY BELIEVES IS A QUALIFIED INSTITUTIONAL
BUYER (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT) IN A TRANSACTION
MEETING THE REQUIREMENTS OF RULE 144A, (b) IN A TRANSACTION MEETING THE
REQUIREMENTS OF RULE 144 UNDER THE SECURITIES ACT, (c) OUTSIDE THE UNITED STATES
TO A FOREIGN PERSON IN A TRANSACTION MEETING THE REQUIREMENTS OF RULE 904 UNDER
THE SECURITIES ACT OR (d) IN ACCORDANCE WITH ANOTHER EXEMPTION FROM THE
REGISTRATION REQUIREMENTS OF THE SECURITIES ACT (AND BASED UPON AN OPINION OF
COUNSEL IF THE COMPANY SO REQUESTS), (2) TO THE COMPANY OR (3) PURSUANT TO AN
EFFECTIVE REGISTRATION STATEMENT, IN EACH CASE, IN ACCORDANCE WITH ANY
APPLICABLE SECURITIES LAWS OF ANY STATE OF THE UNITED STATES OR ANY OTHER
APPLICABLE JURISDICTION AND (B) THE HOLDER WILL, AND EACH SUBSEQUENT HOLDER IS
REQUIRED TO, NOTIFY ANY PURCHASER FROM IT OF THE SECURITY EVIDENCED HEREBY OF
THE RESALE RESTRICTIONS SET FORTH IN (A) ABOVE.

----------
(1)  This paragraph should be included only if the Note is issued in global
     form.


                                       A-2



          Capitalized terms used herein shall have the meanings assigned to them
in the Indenture referred to below unless otherwise indicated.

     1. INTEREST. L-3 Communications Corporation, a Delaware corporation (the
"Company"), promises to pay interest on the principal amount of this Note at 6
3/8% per annum from July 29, 2005 until maturity and shall pay the Additional
Interest payable pursuant to Section 5 of the Registration Rights Agreement
referred to below. The Company will pay interest and Additional Interest, if
any, semi-annually on April 15 and October 15 of each year, or if any such day
is not a Business Day, on the next succeeding Business Day (each an "Interest
Payment Date"), with the same force and effect as if made on the date for such
payment. Interest on the Notes will accrue from the most recent date to which
interest has been paid or, if no interest has been paid, from 1:00 p.m. July 29,
2005; provided that if there is no existing Default in the payment of interest,
and if this Note is authenticated between a record date referred to on the face
hereof and the next succeeding Interest Payment Date, interest shall accrue from
such next succeeding Interest Payment Date; provided, further, that the first
Interest Payment Date shall be October 15, 2005. The Company shall pay interest
(including post-petition interest in any proceeding under any Bankruptcy Law) on
overdue principal and premium, if any, from time to time on demand at a rate
that is 1% per annum in excess of the rate then in effect; it shall pay interest
(including post-petition interest in any proceeding under any Bankruptcy Law) on
overdue installments of interest and Additional Interest (without regard to any
applicable grace periods) from time to time on demand at the same rate to the
extent lawful. Interest will be computed on the basis of a 360-day year of
twelve 30-day months.

     2. METHOD OF PAYMENT. The Company will pay interest on the Notes (except
defaulted interest) and Additional Interest, if any, to the Persons who are
registered Holders of Notes at the close of business on the April 1 and October
1 next (whether or not a Business Day) preceding the Interest Payment Date, even
if such Notes are canceled after such record date and on or before such Interest
Payment Date, except as provided in Section 2.12 of the Indenture with respect
to defaulted interest. The Notes will be payable as to principal, premium and
Additional Interest, if any, and interest at the office or agency of the Company
maintained for such purpose within The City and State of New York, or, at the
option of the Company, payment of interest and Additional Interest may be made
by check mailed to the Holders at their addresses set forth in the register of
Holders; provided that payment by wire transfer of immediately available funds
will be required with respect to principal of and interest, premium and
Additional Interest on, all Global Notes and all other Notes the Holders of
which shall have provided wire transfer instructions to the Company or the
Paying Agent if such Holders shall be registered Holders of at least $250,000 in
principal amount of the Notes. Such payment shall be in such coin or currency of
the United States of America as at the time of payment is legal tender for
payment of public and private debts.

     3. PAYING AGENT AND REGISTRAR. Initially, The Bank of New York, the Trustee
under the Indenture, will act as Paying Agent and Registrar. The Company may
change any Paying Agent or Registrar without notice to any Holder. The Company
or any of its Subsidiaries may act in any such capacity.

     4. INDENTURE. The Company issued the Notes under an Indenture dated as of
July 29, 2005 ("Indenture") among the Company, the Guarantors named therein and
the Trustee.


                                       A-3



The terms of the Notes include those stated in the Indenture and those made part
of the Indenture by reference to the Trust Indenture Act of 1939, as amended (15
U.S. Code Sections 77aaa-77bbbb). The Notes are subject to all such terms, and
Holders are referred to the Indenture and such Act for a statement of such
terms. To the extent any provision of this Note conflicts with the express
provisions of the Indenture, the provisions of the Indenture shall govern and be
controlling.

     5. OPTIONAL REDEMPTION.

          (a) Except as set forth in clause (b) of this paragraph 5, the Notes
shall not be redeemable at the Company's option prior to October 15, 2010.
Thereafter, the Notes shall be subject to redemption at any time at the option
of the Company, in whole or in part, upon not less than 30 nor more than 60
days' notice, at the redemption prices (expressed as percentages of principal
amount) set forth below plus accrued and unpaid interest and Additional Interest
thereon, if any, to the applicable redemption date, if redeemed during the
twelve-month period beginning on October 15 of the years indicated below:

YEAR                                                                  PERCENTAGE
----                                                                  ----------
2010 ..............................................................    103.188%
2011 ..............................................................    102.125%
2012 ..............................................................    101.063%
2013 and thereafter ...............................................    100.000%

          (b) Notwithstanding the foregoing, before October 15, 2008, the
Company may on any one or more occasions redeem up to an aggregate of 35% of the
Notes originally issued at a redemption price of 106.375% of the principal
amount thereof, plus accrued and unpaid interest and Additional Interest
thereon, if any, to the redemption date, with the net cash proceeds of one or
more Equity Offerings by the Company or the net cash proceeds of one or more
Equity Offerings by Holdings that are contributed to the Company as common
equity capital; provided that at least 65% of the Notes originally issued remain
outstanding immediately after the occurrence of each such redemption; and
provided, further, that any such redemption must occur within 120 days of the
date of the closing of such Equity Offering.

     6. MANDATORY REDEMPTION.

          Except as set forth in paragraph 7 below, the Company shall not be
required to make mandatory redemption payments with respect to the Notes.

     7. REPURCHASE AT OPTION OF HOLDER.

          (a) If there is a Change of Control, the Company shall be required to
make an offer (a "Change of Control Offer") to repurchase all or any part (equal
to $100,000 or an integral multiple of $1,000 in excess thereof) of each
Holder's Notes at a purchase price equal to 101% of aggregate principal amount
thereof plus accrued and unpaid interest, if any, to the date of purchase (the
"Change of Control Payment"). Within 10 days following any Change of Control,
the Company shall mail a notice to each Holder setting forth the procedures
governing the Change of Control Offer as required by the Indenture.


                                       A-4



          (b) If the Company or a Subsidiary consummates any Asset Sales, within
five Business Days of each date on which the aggregate amount of Excess Proceeds
exceeds $25.0 million, the Company will be required to make an offer to all
Holders of the Notes (an "Asset Sale Offer") and any other Indebtedness that
ranks pari passu with the Notes (including the 2002 Notes, the May 2003 Notes,
the December 2003 Notes and the November 2004 Notes) that, by its terms,
requires the Company to offer to repurchase such Indebtedness with such Excess
Proceeds to purchase the maximum principal amount of Notes and pari passu
Indebtedness that may be purchased out of such Excess Proceeds at an offer price
in cash in an amount equal to 100% of the principal amount thereof plus accrued
and unpaid interest thereon, if any, to the date of purchase, in accordance with
the procedures set forth in the Indenture. To the extent that the aggregate
amount of Notes or pari passu Indebtedness tendered pursuant to an Asset Sale
Offer is less than the Excess Proceeds, the Company may use any Excess Proceeds
for general corporate purposes. If the aggregate principal amount of Notes or
pari passu Indebtedness surrendered by Holders thereof exceeds the amount of
Excess Proceeds in an Asset Sale Offer, the Company shall repurchase such
Indebtedness on a pro rata basis and the Trustee shall select the Notes to be
purchased on a pro rata basis. Holders of Notes that are the subject of an offer
to purchase will receive an Asset Sale Offer from the Company prior to any
related purchase date and may elect to have such Notes purchased by completing
the form entitled "Option of Holder to Elect Purchase" on the reverse of the
Notes.

     8. NOTICE OF REDEMPTION. Notice of redemption will be mailed at least 30
days but not more than 60 days before the redemption date to each Holder whose
Notes are to be redeemed at its registered address. Notes in denominations
larger than $100,000 may be redeemed in part but only in whole multiples of
$1,000, unless all of the Notes held by a Holder are to be redeemed. On and
after the redemption date interest ceases to accrue on Notes or portions thereof
called for redemption.

     9. DENOMINATIONS, TRANSFER, EXCHANGE. The Notes are in registered form
without coupons in denominations of $100,000 and integral multiples of $1,000 in
excess thereof. The transfer of Notes may be registered and Notes may be
exchanged as provided in the Indenture. The Registrar and the Trustee may
require a Holder, among other things, to furnish appropriate endorsements and
transfer documents and the Company may require a Holder to pay any taxes and
fees required by law or permitted by the Indenture. The Company need not
exchange or register the transfer of any Note or portion of a Note selected for
redemption, except for the unredeemed portion of any Note being redeemed in
part. Also, it need not exchange or register the transfer of any Notes for a
period of 15 days before a selection of Notes to be redeemed or during the
period between a record date and the corresponding Interest Payment Date.

     10. PERSONS DEEMED OWNERS. The registered Holder of a Note may be treated
as its owner for all purposes.

     11. AMENDMENT, SUPPLEMENT AND WAIVER. Subject to certain exceptions, the
Indenture or the Notes may be amended or supplemented with the consent of the
Holders of at least a majority in principal amount of the then outstanding
Notes, and any existing default or compliance with any provision of the
Indenture or the Notes may be waived with the consent of the Holders of a
majority in principal amount of the then outstanding Notes. Without the consent
of any Holder of a Note, the Indenture or the Notes may be amended or
supplemented to cure


                                       A-5



any ambiguity, defect or inconsistency, to provide for uncertificated Notes in
addition to or in place of certificated Notes, to provide for the assumption of
the Company's obligations to Holders of the Notes in case of a merger or
consolidation, to make any change that would provide any additional rights or
benefits to the Holders of the Notes or that does not adversely affect the legal
rights under the Indenture of any such Holder, or to comply with the
requirements of the SEC in order to effect or maintain the qualification of the
Indenture under the Trust Indenture Act.

     12. DEFAULTS AND REMEDIES. An "Event of Default" occurs if: (i) default for
30 days in the payment when due of interest on, or Additional Interest with
respect to, the Notes (whether or not prohibited by the subordination provisions
of the Indenture); (ii) default in payment when due of the principal of or
premium, if any, on the Notes (whether or not prohibited by the subordination
provisions of the Indenture); (iii) failure by the Company to comply with the
covenants contained in sections 4.10, 4.15 or 5.01 of the Indenture; (iv)
failure by the Company for 60 days after notice to comply with any of its other
agreements in the Indenture or the Notes; (v) default under any mortgage,
indenture or instrument under which there may be issued or by which there may be
secured or evidenced any Indebtedness for money borrowed by the Company or any
of its Restricted Subsidiaries (or the payment of which is guaranteed by the
Company or any of its Restricted Subsidiaries) whether such Indebtedness or
guarantee now exists, or is created after the date of the Indenture, which
default results in the acceleration of such Indebtedness prior to its express
maturity and, in each case, the principal amount of any such Indebtedness,
together with the principal amount of any other such Indebtedness the maturity
of which has been so accelerated, aggregates $50.0 million or more; (vi) failure
by the Company or any of its Restricted Subsidiaries to pay final judgments
aggregating in excess of $50.0 million, which judgments are not paid, discharged
or stayed for a period of 60 days; (vii) certain events of bankruptcy or
insolvency with respect to the Company or any of its Significant Subsidiaries or
any group of Subsidiaries that, taken as a whole, would constitute a Significant
Subsidiary; and (viii) except as permitted by the Indenture, any Subsidiary
Guarantee shall be held in any judicial proceeding to be unenforceable or
invalid.

     If any Event of Default occurs and is continuing, the Trustee or the
Holders of at least 25% in principal amount of the then outstanding Notes may
declare all the Notes to be due and payable immediately; provided, however, that
so long as any Designated Senior Debt is outstanding, such declaration shall not
become effective until the earlier of (i) the day which is five Business Days
after receipt by the Representatives of Designated Senior Debt of such notice of
acceleration or (ii) the date of acceleration of any Designated Senior Debt.
Notwithstanding the foregoing, in the case of an Event of Default arising from
certain events of bankruptcy or insolvency, with respect to the Company or any
Significant Subsidiary or any group of Subsidiaries that, taken as a whole,
would constitute a Significant Subsidiary, all outstanding Notes will become due
and payable without further action or notice. Holders of the Notes may not
enforce the Indenture or the Notes except as provided in the Indenture. Subject
to certain limitations, Holders of a majority in principal amount of the then
outstanding Notes may direct the Trustee in its exercise of any trust or power.
The Trustee may withhold from Holders of the Notes notice of any continuing
Default or Event of Default (except a Default or Event of Default relating to
the payment of principal or interest) if it determines that withholding notice
is in their interest.


                                       A-6



     The Holders of a majority in aggregate principal amount of the Notes then
outstanding by notice to the Trustee may on behalf of the Holders of all of the
Notes waive any existing Default or Event of Default and its consequences under
the Indenture except a continuing Default or Event of Default in the payment of
interest on, or the principal of, the Notes.

     13. SUBORDINATION. Payment of the principal of, premium and Additional
Interest, if any, or interest on the Notes is subordinated to the prior payment
of Senior Debt on the terms provided in the Indenture.

     14. TRUSTEE DEALINGS WITH COMPANY. The Trustee, in its individual or any
other capacity, may make loans to, accept deposits from, and perform services
for the Company or its Affiliates, and may otherwise deal with the Company or
its Affiliates, as if it were not the Trustee.

     15. NO RECOURSE AGAINST OTHERS. A director, officer, employee, incorporator
or stockholder, of the Company or any Subsidiary of the Company, as such, shall
not have any liability for any obligations of the Company or any Subsidiary of
the Company under the Notes, the Indenture or the Subsidiary Guarantees or for
any claim based on, in respect of, or by reason of, such obligations or their
creation. Each Holder by accepting a Note waives and releases all such
liability. The waiver and release are part of the consideration for the issuance
of the Notes.

     16. AUTHENTICATION. This Note shall not be valid until authenticated by the
manual signature of the Trustee or an authenticating agent.

     17. ABBREVIATIONS. Customary abbreviations may be used in the name of a
Holder or an assignee, such as: TEN COM (= tenants in common), TEN ENT (=
tenants by the entireties), JT TEN (= joint tenants with right of survivorship
and not as tenants in common), CUST (= custodian), and U/G/M/A (= Uniform Gifts
to Minors Act).

     18. ADDITIONAL RIGHTS OF HOLDERS OF TRANSFER RESTRICTED SECURITIES. In
addition to the rights provided to Holders of Notes under the Indenture, Holders
of Transferred Restricted Securities shall have all the rights set forth in the
Registration Rights Agreement dated as of July 29, 2005, between the Company and
the parties named on the signature pages thereof, or, with respect to any
Additional Notes, Holders of Transfer Restricted Securities shall have all the
rights set forth in one or more registration rights agreements between the
Company and the other parties thereto, relating to rights given by the Company
to the purchasers of Additional Notes (collectively, the "Registration Rights
Agreement").

     19. CUSIP NUMBERS. Pursuant to a recommendation promulgated by the
Committee on Uniform Security Identification Procedures, the Company has caused
CUSIP numbers to be printed on the Notes and the Trustee may use CUSIP numbers
in notices of redemption as a convenience to Holders. No representation is made
as to the accuracy of such numbers either as printed on the Notes or as
contained in any notice of redemption and reliance may be placed only on the
other identification numbers placed thereon.

     20. GOVERNING LAW. This Note shall be governed by, and construed in
accordance with, the laws of the State of New York.


                                       A-7



     The Company will furnish to any Holder upon written request and without
charge a copy of the Indenture and/or the Registration Rights Agreement.
Requests may be made to:

          L-3 Communications Corporation
          600 Third Avenue, 34th Floor,
          New York, New York 10016
          Attention: Senior Vice President-Finance (Fax: 212-805-5440)


                                       A-8



                                 ASSIGNMENT FORM

     To assign this Note, fill in the form below: (I) or (we) assign and
                           transfer this Note to

________________________________________________________________________________
                  (Insert assignee's soc. sec. or tax I.D. no.)

________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________
              (Print or type assignee's name, address and zip code)

and irrevocably appoint ________________________________________________________
to transfer this Note on the books of the Company. The agent may substitute
another to act for him.

Date: ______________________


                               Your Signature:
                                               ---------------------------------
                               (Sign exactly as your name appears on the face of
                                                   this Note)

Signature Guarantee.


                                       A-9



                       Option of Holder to Elect Purchase

     If you want to elect to have this Note purchased by the Company pursuant to
Section 4.10 or 4.15 of the Indenture, check the box below:

     [_] Section 4.10   [_] Section 4.15

     If you want to elect to have only part of the Note purchased by the Company
pursuant to Section 4.10 or Section 4.15 of the Indenture, state the amount you
elect to have purchased: $______________


Date: ______________________   Your Signature:
                                               ---------------------------------
                               (Sign exactly as your name appears on the Note)

                               Tax Identification No.: _________________________

Signature Guarantee.


                                      A-10



              Schedule of Exchanges of Interests in the Global Note

     The following exchanges of a part of this Global Note for an interest in
another Global Note or for a Definitive Note, or exchanges of a part of another
Global Note or Definitive Note for an interest in this Global Note, have been
made:

                                                Principal
              Amount of        Amount of     Amount of this      Signature of
             decrease in      increase in      Global Note        authorized
              Principal        Principal     following such   officer of Trustee
 Date of   Amount of this   Amount of this      decrease           or Note
Exchange     Global Note      Global Note     (or increase)        Custodian
--------   --------------   --------------   --------------   ------------------


                                      A-11



                                                                       EXHIBIT B

                         FORM OF CERTIFICATE OF TRANSFER

L-3 Communications Corporation
600 Third Avenue, 34th Floor,
New York, New York 10016

[Registrar address block]

     Re: 6 3/8% Senior Subordinated Notes due 2015.

     Reference is hereby made to the Indenture, dated as of July 29, 2005 (the
"Indenture"), among L-3 Communications Corporation, as issuer (the "Company"),
the Guarantors party thereto and The Bank of New York, as trustee. Capitalized
terms used but not defined herein shall have the meanings given to them in the
Indenture.

     ________________, (the "Transferor") owns and proposes to transfer the
Note[s] or interest in such Note[s] specified in Annex A hereto, in the
principal amount of $___________ in such Note[s] or interests (the "Transfer"),
to ___________ (the "Transferee"), as further specified in Annex A hereto. In
connection with the Transfer, the Transferor hereby certifies that:

                             [CHECK ALL THAT APPLY]

1. [_] CHECK IF TRANSFEREE WILL TAKE DELIVERY OF BOOK-ENTRY INTERESTS IN THE
144A GLOBAL NOTE OR DEFINITIVE NOTES PURSUANT TO RULE 144A. The Transfer is
being effected pursuant to and in accordance with Rule 144A under the United
States Securities Act of 1933, as amended (the "Securities Act"), and,
accordingly, the Transferor hereby further certifies that the Book-Entry
Interests or Definitive Notes are being transferred to a Person that the
Transferor reasonably believes is purchasing the Book-Entry Interests or
Definitive Notes for its own account, or for one or more accounts with respect
to which such Person exercises sole investment discretion, and such Person and
each such account is a "qualified institutional buyer" within the meaning of
Rule 144A in a transaction meeting the requirements of Rule 144A and such
Transfer is in compliance with any applicable blue sky securities laws of any
state of the United States. Upon consummation of the proposed Transfer in
accordance with the terms of the Indenture, the transferred Book-Entry Interest
or Definitive Note will be subject to the restrictions on transfer enumerated in
the Private Placement Legend printed on the 144A Global Note and/or the
Definitive Note and in the Indenture and the Securities Act.

2. [_] CHECK IF TRANSFEREE WILL TAKE DELIVERY OF BOOK-ENTRY INTERESTS IN THE
TEMPORARY REGULATION S GLOBAL NOTE, THE REGULATION S GLOBAL NOTE OR DEFINITIVE
NOTES PURSUANT TO REGULATION S. The Transfer is being effected pursuant to and
in accordance with Rule 903 or Rule 904 under the Securities Act and,
accordingly, the Transferor hereby further certifies that (i) the Transfer is
not being made to a person in the United States and (x) at the time the buy
order was originated, the Transferee was outside the United States or such
Transferor and any Person acting on its behalf reasonably believed and believes
that the Transferee was outside the United States or (y) the transaction was
executed in, on or through the facilities of a designated offshore securities
market and neither such Transferor nor any Person acting on its behalf knows
that the


                                       B-1



transaction was prearranged with a buyer in the United States, (ii) no directed
selling efforts have been made in contravention of the requirements of Rule
903(b) or Rule 904(b) of Regulation S under the Securities Act and (iii) the
transaction is not part of a plan or scheme to evade the registration
requirements of the Securities Act and (iv) if the proposed transfer is being
made prior to the expiration of the Restricted Period, the transfer is not being
made to a U.S. Person or for the account or benefit of a U.S. Person (other than
an Initial Purchaser). Upon consummation of the proposed transfer in accordance
with the terms of the Indenture, the transferred Book-Entry Interest or
Definitive Note will be subject to the restrictions on Transfer enumerated in
the Private Placement Legend printed on the Regulation S Global Note and/or the
Definitive Note and in the Indenture and the Securities Act.

3. [_] CHECK AND COMPLETE IF TRANSFEREE WILL TAKE DELIVERY OF BOOK-ENTRY
INTERESTS IN THE IAI GLOBAL NOTE OR DEFINITIVE NOTES PURSUANT TO ANY PROVISION
OF THE SECURITIES ACT OTHER THAN RULE 144A OR REGULATION S. The Transfer is
being effected in compliance with the transfer restrictions applicable to
Book-Entry Interests in Restricted Global Notes and Definitive Notes bearing the
Private Placement Legend and pursuant to and in accordance with the Securities
Act and any applicable blue sky securities laws of any State of the United
States, and accordingly the Transferor hereby further certifies that (check
one):

     (a) [_] such Transfer is being effected pursuant to and in accordance with
Rule 144 under the Securities Act;

                                       OR

     (b) [_] such Transfer is being effected to the Company or a subsidiary
thereof,

                                       OR

     (c) [_] such Transfer is being effected pursuant to an effective
registration statement under the Securities Act;

                                       OR

     (d) [_] such Transfer is being effected to an Institutional Accredited
Investor and pursuant to an exemption from the registration requirements of the
Securities Act other than Rule 144A, Rule 144 or Rule 904, and the Transferor
hereby further certifies that the Transfer complies with the transfer
restrictions applicable to Book-Entry Interests in a Restricted Global Note or
Definitive Notes bearing the Private Placement Legend and the requirements of
the exemption claimed, which certification is supported by (x) if such Transfer
is in respect of a principal amount of Notes at the time of Transfer of $250,000
or more, a certificate executed by the Transferee in the form of Exhibit D to
the Indenture, or (y) if such Transfer is in respect of a principal amount of
Notes at the time of transfer of less than $250,000, (1) a certificate executed
by the Transferee in the form of Exhibit D to the Indenture and (2) an Opinion
of Counsel provided by the Transferor or the Transferee (a copy of which the
Transferor has attached to this certification), to the effect that (1) such
Transfer is in compliance with the Securities Act and (2) such Transfer complies
with any applicable blue sky securities laws of any state of the United States.
Upon consummation of the proposed transfer in accordance with the terms of the
Indenture, the transferred Book-Entry Interest or Definitive Note will be
subject to the restrictions on transfer enumerated in the Private Placement
Legend printed on the IAI Global Note and/or the Definitive Notes and in the
Indenture and the Securities Act.


                                       B-2



4. [_] CHECK IF TRANSFEREE WILL TAKE DELIVERY OF BOOK-ENTRY INTERESTS IN THE
UNRESTRICTED GLOBAL NOTE OR IN DEFINITIVE NOTES THAT DO NOT BEAR THE PRIVATE
PLACEMENT LEGEND.

     (a) [_] CHECK IF TRANSFER IS PURSUANT TO RULE 144. (i) The Transfer is
being effected pursuant to and in accordance with Rule 144 under the Securities
Act and in compliance with the transfer restrictions contained in the Indenture
and any applicable blue sky securities laws of any state of the United States
and (ii) the restrictions on transfer contained in the Indenture and the Private
Placement Legend are not required in order to maintain compliance with the
Securities Act. Upon consummation of the proposed Transfer in accordance with
the terms of the Indenture, the transferred Book-Entry Interests or Definitive
Notes will no longer be subject to the restrictions on transfer enumerated in
the Private Placement Legend printed on the Restricted Global Notes, on
Definitive Notes bearing the Private Placement Legend and in the Indenture.

     (b) [_] CHECK IF TRANSFER IS PURSUANT TO REGULATION S. (i) The Transfer is
being effected pursuant to and in accordance with Rule 903 or Rule 904 under the
Securities Act and in compliance with the transfer restrictions contained in the
Indenture and any applicable blue sky securities laws of any state of the United
States and (ii) the restrictions on transfer contained in the Indenture and the
Private Placement Legend are not required in order to maintain compliance with
the Securities Act. Upon consummation of the proposed Transfer in accordance
with the terms of the Indenture, the transferred Book-Entry Interests or
Definitive Notes will no longer be subject to the restrictions on transfer
enumerated in the Private Placement Legend printed on the Restricted Global
Notes, on Definitive Notes bearing the Private Placement Legend and in the
Indenture.

     (c) [_] CHECK IF TRANSFER IS PURSUANT TO OTHER EXEMPTION. (i) The Transfer
is being effected pursuant to and in compliance with an exemption from the
registration requirements of the Securities Act other than Rule 144, Rule 903 or
Rule 904 and in compliance with the transfer restrictions contained in the
Indenture and any applicable blue sky securities laws of any State of the United
States and (ii) the restrictions on transfer contained in the Indenture and the
Private Placement Legend are not required in order to maintain compliance with
the Securities Act. Upon consummation of the proposed Transfer in accordance
with the terms of the Indenture, the transferred Book-Entry Interests or
Definitive Notes will not be subject to the restrictions on transfer enumerated
in the Private Placement Legend printed on the Restricted Global Notes or
Definitive Notes bearing the Private Placement Legend and in the Indenture.

     This certificate and the statements contained herein are made for your
benefit and the benefit of the Company.

                                       _________________________________________
                                       [Insert Name of Transferor]


                                       By:
                                           -------------------------------------
                                           Name:
                                           Title:

Dated: ____________, ____


                                       B-3



                       ANNEX A TO CERTIFICATE OF TRANSFER

1.   The Transferor owns and proposes to transfer the following:

                            [CHECK ONE OF (A) OR (B)]

     (a)  [_] Book-Entry Interests in the:

          (i)  [_] 144A Global Note (CUSIP _______), or

          (ii) [_] Regulation S Global Note (CUSIP ______), or

          (iii) [_] IAI Global Note (CUSIP ________); or

     (b)  [_] Restricted Definitive Notes.

2.   After the Transfer the Transferee will hold:

                                   [CHECK ONE]

     (a)  [_] Book-Entry Interests in the:

          (i)  [_] 144A Global Note (CUSIP _____), or

          (ii) [_] Regulation S Global Note (CUSIP _____), or

          (iii) [_] IAI Global Note (CUSIP ______); or

          (iv) [_] Unrestricted Global Note (CUSIP ______); or

     (b)  [_] Restricted Definitive Notes; or

     (c)  [_] Definitive Notes that do not bear the Private Placement Legend, in
          accordance with the terms of the Indenture.


                                       B-4



                                                                       EXHIBIT C

                         FORM OF CERTIFICATE OF EXCHANGE

L-3 Communications Corporation
600 Third Avenue, 34th Floor,
New York, New York 10016
Attention: Vice President-Finance (Fax: 212-805-5440)

     Re: 6 3/8% Senior Subordinated Notes due 2015

                             (CUSIP [____________])

          Reference is hereby made to the Indenture, dated as of July __, 2005
(the "Indenture"), among L-3 Communications Corporation, as issuer (the
"Company"), the Guarantors party thereto and The Bank of New York, as trustee.
Capitalized terms used but not defined herein shall have the meanings given to
them in the Indenture.

          ______________, (the "Holder") owns and proposes to exchange the
Note[s] or interest in such Note[s] specified herein, in the principal amount of
$______________ in such Note[s] or interests (the "Exchange"). In connection
with the Exchange, the Holder hereby certifies that:

1. EXCHANGE OF RESTRICTED DEFINITIVE NOTES OR RESTRICTED BOOK-ENTRY INTERESTS
FOR DEFINITIVE NOTES THAT DO NOT BEAR THE PRIVATE PLACEMENT LEGEND OR
UNRESTRICTED BOOK-ENTRY INTERESTS

     (a) [_] CHECK IF EXCHANGE IS FROM RESTRICTED BOOK-ENTRY INTEREST TO
UNRESTRICTED BOOK-ENTRY INTEREST. In connection with the Exchange of the
Holder's Restricted Book-Entry Interest for Unrestricted Book-Entry Interests in
an equal principal amount, the Holder hereby certifies (i) the Unrestricted
Book-Entry Interests are being acquired for the Holder's own account without
transfer, (ii) such Exchange has been effected in compliance with the transfer
restrictions applicable to the Global Notes and pursuant to and in accordance
with the United States Securities Act of 1933, as amended (the "Securities
Act"), (iii) the restrictions on transfer contained in the Indenture and the
Private Placement Legend are not required in order to maintain compliance with
the Securities Act and (iv) the Unrestricted Book-Entry Interests are being
acquired in compliance with any applicable blue sky securities laws of any state
of the United States.

     (b) [_] CHECK IF EXCHANGE IS FROM RESTRICTED BOOK-ENTRY INTEREST TO
DEFINITIVE NOTES THAT DO NOT BEAR THE PRIVATE PLACEMENT LEGEND. In connection
with the Exchange of the Holder's Restricted Book-Entry Interests for Definitive
Notes that do not bear the Private Placement Legend, the Holder hereby certifies
(i) the Definitive Notes are being acquired for the Holder's own account without
transfer, (ii) such Exchange has been effected in compliance with the transfer
restrictions applicable to the Restricted Global Notes and pursuant to and in
accordance with the Securities Act, (iii) the restrictions on transfer contained
in the Indenture and the Private Placement Legend are not required in order to
maintain compliance with the


                                       C-1



Securities Act and (iv) the Definitive Notes are being acquired in compliance
with any applicable blue sky securities laws of any state of the United States.

     (c) [_] CHECK IF EXCHANGE IS FROM RESTRICTED DEFINITIVE NOTES TO
UNRESTRICTED BOOK-ENTRY INTERESTS. In connection with the Holder's Exchange of
Restricted Definitive Notes for Unrestricted Book-Entry Interests, (i) the
Unrestricted Book-Entry Interests are being acquired for the Holder's own
account without transfer, (ii) such Exchange has been effected in compliance
with the transfer restrictions applicable to Restricted Definitive Notes and
pursuant to and in accordance with the Securities Act, (iii) the restrictions on
transfer contained in the Indenture and the Private Placement Legend are not
required in order to maintain compliance with the Securities Act and (iv) the
Unrestricted Book-Entry Interests are being acquired in compliance with any
applicable blue sky securities laws of any state of the United States.

     (d) [_] CHECK IF EXCHANGE IS FROM RESTRICTED DEFINITIVE NOTES TO DEFINITIVE
NOTES THAT DO NOT BEAR THE PRIVATE PLACEMENT LEGEND. In connection with the
Holder's Exchange of a Restricted Definitive Note for Definitive Notes that do
not bear the Private Placement Legend, the Holder hereby certifies (i) the
Definitive Notes that do not bear the Private Placement Legend are being
acquired for the Holder's own account without transfer, (ii) such Exchange has
been effected in compliance with the transfer restrictions applicable to
Restricted Definitive Notes and pursuant to and in accordance with the
Securities Act , (iii) the restrictions on transfer contained in the Indenture
and the Private Placement Legend are not required in order to maintain
compliance with the Securities Act and (iv) the Notes are being acquired in
compliance with any applicable blue sky securities laws of any state of the
United States.

2. EXCHANGE OF RESTRICTED DEFINITIVE NOTES OR RESTRICTED BOOK-ENTRY INTERESTS
FOR RESTRICTED DEFINITIVE NOTES OR RESTRICTED BOOK-ENTRY INTERESTS

     (a) [_] CHECK IF EXCHANGE IS FROM RESTRICTED BOOK-ENTRY INTERESTS TO
RESTRICTED DEFINITIVE NOTE. In connection with the Exchange of the Holder's
Restricted Book-Entry Interest for Restricted Definitive Notes with an equal
principal amount, (i) the Restricted Definitive Notes are being acquired for the
Holder's own account without transfer and (ii) such Exchange has been effected
in compliance with the transfer restrictions applicable to the Restricted Global
Notes and pursuant to and in accordance with the Securities Act, and in
compliance with any applicable blue sky securities laws of any state of the
United States. Upon consummation of the proposed Exchange in accordance with the
terms of the Indenture, the Restricted Definitive Notes issued will be subject
to the restrictions on transfer enumerated in the Private Placement Legend
printed on the Restricted Definitive Notes and in the Indenture and the
Securities Act.

     (b) [_] CHECK IF EXCHANGE IS FROM RESTRICTED DEFINITIVE NOTES TO RESTRICTED
BOOK-ENTRY INTERESTS. In connection with the Exchange of the Holder's Restricted
Definitive Note for Restricted Book-Entry Interests in the [CHECK ONE] [_] 144A
Global Note, [_] Regulation S Global Note, [_] IAI Global Note with an equal
principal amount, (i) the Definitive Notes are being acquired for the Holder's
own account without transfer and (ii) such Exchange has been effected in
compliance with the transfer restrictions applicable to the Restricted
Definitive Note and pursuant to and in accordance with the Securities Act, and
in compliance with any applicable blue sky securities laws of any state of the
United States. Upon


                                       C-2



consummation of the proposed Exchange in accordance with the terms of the
Indenture, the Book-Entry Interests issued will be subject to the restrictions
on transfer enumerated in the Private Placement Legend printed on the relevant
Restricted Global Note and in the Indenture and the Securities Act.

     This certificate and the statements contained herein are made for your
benefit and the benefit of the Company.

                                        ________________________________________
                                        [Insert Name of Transferor]


                                        By:
                                            ------------------------------------
                                            Name:
                                            Title:

Dated: ____________, ____


                                       C-3



                                                                       EXHIBIT D

                            FORM OF CERTIFICATE FROM
                   ACQUIRING INSTITUTIONAL ACCREDITED INVESTOR

L-3 Communications Corporation
600 Third Avenue, 34th Floor,
New York, New York 10016
Attention: Vice President-Finance (Fax: 212-805-5440)

     Re: 6 3/8% Senior Subordinated Notes due 2015

          Reference is hereby made to the Indenture, dated as of July 29, 2005
(the "Indenture"), among L-3 Communications Corporation, as issuer (the
"Company"), the Guarantors party thereto and The Bank of New York, as trustee.
Capitalized terms used but not defined herein shall have the meanings given to
them in the Indenture.

          In connection with our proposed purchase of $____________ aggregate
principal amount at maturity of:

     (a)  [_] Book-Entry Interests, or

     (b)  [_] Definitive Notes,

     we confirm that:

          1. We understand that any subsequent transfer of the Notes or any
interest therein is subject to certain restrictions and conditions set forth in
the Indenture and the undersigned agrees to be bound by, and not to resell,
pledge or otherwise transfer the Notes or any interest therein except in
compliance with, such restrictions and conditions and the United States
Securities Act of 1933, as amended (the "Securities Act").

          2. We understand that the offer and sale of the Notes have not been
registered under the Securities Act, and that the Notes and any interest therein
may not be offered or sold except as permitted in the following sentence. We
agree, on our own behalf and on behalf of any accounts for which we are acting
as hereinafter stated, that if we should sell the Notes or any interest therein,
we will do so only (A) to the Company or any subsidiary thereof, (B) in
accordance with Rule 144A under the Securities Act to a "qualified institutional
buyer" (as defined therein), (C) to an institutional "accredited investor" (as
defined below) that, prior to such transfer, furnishes (or has furnished on its
behalf by a U.S. broker-dealer) to you and to the Company a signed letter
substantially in the form of this letter and, if such transfer is in respect of
a principal amount of Notes, at the time of transfer of less than $250,000, an
Opinion of Counsel in form reasonably acceptable to the Company to the effect
that such transfer is in compliance with the Securities Act, (D) outside the
United States in accordance with Rule 904 of Regulation S under the Securities
Act, (E) pursuant to the provisions of Rule 144 under the Securities Act or (F)
pursuant to an effective registration statement under the Securities Act, and we
further agree to provide to any person purchasing the Definitive Notes or
Book-Entry


                                       D-1



Interests from us in a transaction meeting the requirements of clauses (A)
through (E) of this paragraph a notice advising such purchaser that resales
thereof are restricted as stated herein.

          3. We understand that, on any proposed resale of the Notes or
Book-Entry Interests, we will be required to furnish to you and the Company such
certifications, legal opinions and other information as you and the Company may
reasonably require to confirm that the proposed sale complies with the foregoing
restrictions. We further understand that the Notes purchased by us will bear a
legend to the foregoing effect. We further understand that any subsequent
transfer by us of the Notes or Book-Entry Interests therein acquired by us must
be effected through one of the Placement Agents.

          4. We are an institutional "accredited investor" (as defined in Rule
501(a)(1), (2), (3) or (7) of Regulation D under the Securities Act) and have
such knowledge and experience in financial and business matters as to be capable
of evaluating the merits and risks of our investment in the Notes, and we and
any accounts for which we are acting are each able to bear the economic risk of
our or its investment.

          5. We are acquiring the Notes or Book-Entry Interests purchased by us
for our own account or for one or more accounts (each of which is an
institutional "accredited investor") as to each of which we exercise sole
investment discretion.

          You and the Company are entitled to rely upon this letter and are
irrevocably authorized to produce this letter or a copy hereof to any interested
party in any administrative or legal proceedings or official inquiry with
respect to the matters covered hereby.

                                        ________________________________________
                                        [Insert Name of Accredited Investor]


                                        By:
                                            ------------------------------------
                                            Name:
                                            Title:

Dated: ____________, ____


                                       D-2



                                                                       EXHIBIT E

                 FORM OF SUPPLEMENTAL INDENTURE TO BE DELIVERED
                           BY GUARANTEEING SUBSIDIARY

          SUPPLEMENTAL INDENTURE (this "Supplemental Indenture"), dated as of
_________________, among ____________________ (the "Guaranteeing Subsidiaries"),
each a direct or indirect subsidiary of L-3 Communications Corporation (or its
permitted successor), a Delaware corporation (the "Company"), the Company and
The Bank of New York, as trustee under the indenture referred to below (the
"Trustee").

                                   WITNESSETH

          WHEREAS, the Company has heretofore executed and delivered to the
Trustee an indenture (the "Indenture"), dated as of July 29, 2005 providing for
the issuance of an unlimited amount of 6 3/8% Senior Subordinated Notes due 2015
(the "Notes");

          WHEREAS, the Indenture provides that under certain circumstances the
Guaranteeing Subsidiaries shall execute and deliver to the Trustee a
supplemental indenture pursuant to which the Guaranteeing Subsidiaries shall
unconditionally guarantee all of the Company's Obligations (as defined in the
Indenture) under the Notes and the Indenture on the terms and conditions set
forth herein (the "Subsidiary Guarantee"); and

          WHEREAS, pursuant to Section 9.01 of the Indenture, the Trustee is
authorized to execute and deliver this Supplemental Indenture.

          NOW THEREFORE, in consideration of the foregoing and for other good
and valuable consideration, the receipt of which is hereby acknowledged, the
parties mutually covenant and agree for the equal and ratable benefit of the
Holders of the Notes as follows:

     1. CAPITALIZED TERMS. Capitalized terms used herein without definition
shall have the meanings assigned to them in the Indenture.

     2. AGREEMENT TO GUARANTEE. Each Guaranteeing Subsidiary hereby agrees as
follows:

     (a)  Such Guaranteeing Subsidiary, jointly and severally with all other
          current and future guarantors of the Notes (collectively, the
          "Guarantors" and each, a "Guarantor"), unconditionally guarantees to
          each Holder of a Note authenticated and delivered by the Trustee and
          to the Trustee and its successors and assigns, regardless of the
          validity and enforceability of the Indenture, the Notes or the
          Obligations of the Company under the Indenture or the Notes, that:

          (i)  the principal of, premium, interest and Additional Interest, if
               any, on the Notes will be promptly paid in full when due, whether
               at maturity, by acceleration, redemption or otherwise, and
               interest on the overdue principal of, premium, interest and
               Additional Interest, if any, on the Notes, to the extent lawful,
               and all other Obligations of the Company to


                                       E-1



               the Holders or the Trustee thereunder or under the Indenture will
               be promptly paid in full, all in accordance with the terms
               thereof; and

          (ii) in case of any extension of time for payment or renewal of any
               Notes or any of such other Obligations, that the same will be
               promptly paid in full when due in accordance with the terms of
               the extension or renewal, whether at stated maturity, by
               acceleration or otherwise.

     (b)  Notwithstanding the foregoing, in the event that this Subsidiary
          Guarantee would constitute or result in a violation of any applicable
          fraudulent conveyance or similar law of any relevant jurisdiction, the
          liability of such Guaranteeing Subsidiary under this Supplemental
          Indenture and its Subsidiary Guarantee shall be reduced to the maximum
          amount permissible under such fraudulent conveyance or similar law.

     3.   EXECUTION AND DELIVERY OF SUBSIDIARY GUARANTEES.

     (a)  To evidence its Subsidiary Guarantee set forth in this Supplemental
          Indenture, such Guaranteeing Subsidiary hereby agrees that a notation
          of such Subsidiary Guarantee substantially in the form of Exhibit F to
          the Indenture shall be endorsed by an officer of such Guaranteeing
          Subsidiary on each Note authenticated and delivered by the Trustee
          after the date hereof.

     (b)  Notwithstanding the foregoing, such Guaranteeing Subsidiary hereby
          agrees that its Subsidiary Guarantee set forth herein shall remain in
          full force and effect notwithstanding any failure to endorse on each
          Note a notation of such Subsidiary Guarantee.

     (c)  If an Officer whose signature is on this Supplemental Indenture or on
          the Subsidiary Guarantee no longer holds that office at the time the
          Trustee authenticates the Note on which a Subsidiary Guarantee is
          endorsed, the Subsidiary Guarantee shall be valid nevertheless.

     (d)  The delivery of any Note by the Trustee, after the authentication
          thereof under the Indenture, shall constitute due delivery of the
          Subsidiary Guarantee set forth in this Supplemental Indenture on
          behalf of each Guaranteeing Subsidiary.

     (e)  Each Guaranteeing Subsidiary hereby agrees that its Obligations
          hereunder shall be unconditional, regardless of the validity,
          regularity or enforceability of the Notes or the Indenture, the
          absence of any action to enforce the same, any waiver or consent by
          any Holder of the Notes with respect to any provisions hereof or
          thereof, the recovery of any judgment against the Company, any action
          to enforce the same or any other circumstance which might otherwise
          constitute a legal or equitable discharge or defense of a guarantor.

     (f)  Each Guaranteeing Subsidiary hereby waives diligence, presentment,
          demand of payment, filing of claims with a court in the event of
          insolvency or bankruptcy of the Company, any right to require a
          proceeding first against the Company, protest,


                                       E-2



          notice and all demands whatsoever and covenants that its Subsidiary
          Guarantee made pursuant to this Supplemental Indenture will not be
          discharged except by complete performance of the Obligations contained
          in the Notes and the Indenture.

     (g)  If any Holder or the Trustee is required by any court or otherwise to
          return to the Company or any Guaranteeing Subsidiary, or any
          custodian, Trustee, liquidator or other similar official acting in
          relation to either the Company or such Guaranteeing Subsidiary, any
          amount paid by either to the Trustee or such Holder, the Subsidiary
          Guarantee made pursuant to this Supplemental Indenture, to the extent
          theretofore discharged, shall be reinstated in full force and effect.

     (h)  Each Guaranteeing Subsidiary agrees that it shall not be entitled to
          any right of subrogation in relation to the Holders in respect of any
          Obligations guaranteed hereby until payment in full of all Obligations
          guaranteed hereby. Each Guaranteeing Subsidiary further agrees that,
          as between such Guaranteeing Subsidiary, on the one hand, and the
          Holders and the Trustee, on the other hand:

          (i)  the maturity of the Obligations guaranteed hereby may be
               accelerated as provided in Article 6 of the Indenture for the
               purposes of the Subsidiary Guarantee made pursuant to this
               Supplemental Indenture, notwithstanding any stay, injunction or
               other prohibition preventing such acceleration in respect of the
               Obligations guaranteed hereby; and

          (ii) in the event of any declaration of acceleration of such
               Obligations as provided in Article 6 of the Indenture, such
               Obligations (whether or not due and payable) shall forthwith
               become due and payable by such Guaranteeing Subsidiary for the
               purpose of the Subsidiary Guarantee made pursuant to this
               Supplemental Indenture.

     (i)  Each Guaranteeing Subsidiary shall have the right to seek contribution
          from any other non-paying Guaranteeing Subsidiary so long as the
          exercise of such right does not impair the rights of the Holders or
          the Trustee under the Subsidiary Guarantee made pursuant to this
          Supplemental Indenture.

     4.   GUARANTEEING SUBSIDIARY MAY CONSOLIDATE, ETC. ON CERTAIN TERMS.

     (a)  Except as set forth in Articles 4 and 5 of the Indenture, nothing
          contained in the Indenture, this Supplemental Indenture or in the
          Notes shall prevent any consolidation or merger of any Guaranteeing
          Subsidiary with or into the Company or any other Guarantor or shall
          prevent any transfer, sale or conveyance of the property of any
          Guaranteeing Subsidiary as an entirety or substantially as an
          entirety, to the Company or any other Guarantor.

     (b)  Except as set forth in Articles 4 and 5 of the Indenture, nothing
          contained in the Indenture, this Supplemental Indenture or in the
          Notes shall prevent any consolidation or merger of any Guaranteeing
          Subsidiary with or into a corporation or corporations other than the
          Company or any other Guarantor (in each case, whether or not
          affiliated with the Guaranteeing Subsidiary), or successive
          consolidations or mergers in which a Guaranteeing Subsidiary or its
          successor or successors shall be a party or parties, or shall prevent
          any sale or conveyance of the property of any Guaranteeing Subsidiary
          as an entirety or substantially as an entirety, to a corporation other
          than the Company or any other Guarantor (in each case,


                                       E-3



          whether or not affiliated with the Guaranteeing Subsidiary) authorized
          to acquire and operate the same; provided, however, that each
          Guaranteeing Subsidiary hereby covenants and agrees that (i) subject
          to the Indenture, upon any such consolidation, merger, sale or
          conveyance, the due and punctual performance and observance of all of
          the covenants and conditions of the Indenture and this Supplemental
          Indenture to be performed by such Guaranteeing Subsidiaries, shall be
          expressly assumed (in the event that such Guaranteeing Subsidiary is
          not the surviving corporation in the merger), by supplemental
          indenture satisfactory in form to the Trustee, executed and delivered
          to the Trustee, by the corporation formed by such consolidation, or
          into which such Guaranteeing Subsidiary shall have been merged, or by
          the corporation which shall have acquired such property and (ii)
          immediately after giving effect to such consolidation, merger, sale or
          conveyance no Default or Event of Default exists.

     (c)  In case of any such consolidation, merger, sale or conveyance and upon
          the assumption by the successor corporation, by supplemental
          indenture, executed and delivered to the Trustee and satisfactory in
          form to the Trustee, of the Subsidiary Guarantee made pursuant to this
          Supplemental Indenture and the due and punctual performance of all of
          the covenants and conditions of the Indenture and this Supplemental
          Indenture to be performed by such Guaranteeing Subsidiary, such
          successor corporation shall succeed to and be substituted for such
          Guaranteeing Subsidiary with the same effect as if it had been named
          herein as the Guaranteeing Subsidiary. Such successor corporation
          thereupon may cause to be signed any or all of the Subsidiary
          Guarantees to be endorsed upon the Notes issuable under the Indenture
          which theretofore shall not have been signed by the Company and
          delivered to the Trustee. All the Subsidiary Guarantees so issued
          shall in all respects have the same legal rank and benefit under the
          Indenture and this Supplemental Indenture as the Subsidiary Guarantees
          theretofore and thereafter issued in accordance with the terms of the
          Indenture and this Supplemental Indenture as though all of such
          Subsidiary Guarantees had been issued at the date of the execution
          hereof.

     5.   RELEASES.

     (a)  Concurrently with any sale of assets (including, if applicable, all of
          the Capital Stock of a Guaranteeing Subsidiary), all Liens, if any, in
          favor of the Trustee in the assets sold thereby shall be released;
          provided that in the event of an Asset Sale, the Net Proceeds from
          such sale or other disposition are treated in accordance with the
          provisions of Section 4.10 of the Indenture (it being understood that
          only such portion of the Net Proceeds as is required to be applied on
          or before the date of such sale or other disposition in accordance
          with the terms of this Indenture needs to be applied in accordance
          therewith at such time).


                                       E-4



          If the assets sold in such sale or other disposition include all or
          substantially all of the assets of a Guaranteeing Subsidiary or all of
          the Capital Stock of a Guaranteeing Subsidiary, then the Guaranteeing
          Subsidiary (in the event of a sale or other disposition of all of the
          Capital Stock of such Guaranteeing Subsidiary) or the Person acquiring
          the property (in the event of a sale or other disposition of all or
          substantially all of the assets of such Guaranteeing Subsidiary) shall
          be released from and relieved of its Obligations under this
          Supplemental Indenture and its Subsidiary Guarantee made pursuant
          hereto; provided that in the event of an Asset Sale, the Net Proceeds
          from such sale or other disposition are treated in accordance with the
          provisions of Section 4.10 of the Indenture (it being understood that
          only such portion of the Net Proceeds as is required to be applied on
          or before the date of such sale or other disposition in accordance
          with the terms of this Indenture needs to be applied in accordance
          therewith at such time). Upon delivery by the Company to the Trustee
          of an Officers' Certificate to the effect that such sale or other
          disposition was made by the Company or the Guaranteeing Subsidiary, as
          the case may be, in accordance with the provisions of the Indenture
          and this Supplemental Indenture, including without limitation, Section
          4.10 of the Indenture, the Trustee shall execute any documents
          reasonably required in order to evidence the release of the
          Guaranteeing Subsidiary from its Obligations under this Supplemental
          Indenture and its Subsidiary Guarantee made pursuant hereto. If the
          Guaranteeing Subsidiary is not released from its Obligations under its
          Subsidiary Guarantee, it shall remain liable for the full amount of
          principal of and interest on the Notes and for the other Obligations
          of such Guaranteeing Subsidiary under the Indenture as provided in
          this Supplemental Indenture.

     (b)  Upon the designation of a Guarantor as an Unrestricted Subsidiary in
          accordance with the terms of the Indenture or upon the release of a
          Guarantor from its Guarantees of, and all pledges and security
          interests granted in connection with, all other Indebtedness of the
          Company or any of their Restricted Subsidiaries, such Guaranteeing
          Subsidiary shall be released and relieved of its Obligations under its
          Subsidiary Guarantee and this Supplemental Indenture. Upon delivery by
          the Company to the Trustee of an Officers' Certificate and an Opinion
          of Counsel to the effect that such designation of such Guaranteeing
          Subsidiary as an Unrestricted Subsidiary was made by the Company in
          accordance with the provisions of the Indenture, including without
          limitation Section 4.07 of the Indenture, the Trustee shall execute
          any documents reasonably required in order to evidence the release of
          such Guaranteeing Subsidiary from its Obligations under its Subsidiary
          Guarantee. Any Guaranteeing Subsidiary not released from its
          Obligations under its Subsidiary Guarantee shall remain liable for the
          full amount of principal of and interest on the Notes and for the
          other Obligations of any Guaranteeing Subsidiary under the Indenture
          as provided herein.

     (c)  Each Guaranteeing Subsidiary shall be released and relieved of its
          obligations under this Supplemental Indenture in accordance with, and
          subject to, Section 4.13 of the Indenture.


                                       E-5



     6. NO RECOURSE AGAINST OTHERS. No past, present or future director,
officer, employee, incorporator, stockholder or agent of any Subsidiary of the
Company, as such, shall have any liability for any Obligations of the Company or
any Subsidiary of the Company under the Notes, any Subsidiary Guarantees, the
Indenture or this Supplemental Indenture or for any claim based on, in respect
of, or by reason of, such Obligations or their creation. Each Holder of the
Notes by accepting a Note waives and releases all such liability. The waiver and
release are part of the consideration for issuance of the Notes. Such waiver may
not be effective to waive liabilities under the federal securities laws and it
is the view of the SEC that such a waiver is against public policy.

     7. ANTI-LAYERING; SUBORDINATION OF SUBSIDIARY GUARANTEES. No Guaranteeing
Subsidiary shall incur, create, issue, assume, guarantee or otherwise become
liable for any Indebtedness that is subordinate or junior in right of payment to
any Senior Debt of a Guaranteeing Subsidiary and senior in any respect in right
of payment to any of the Subsidiary Guarantees. Notwithstanding the foregoing
sentence, the Subsidiary Guarantee of each Guaranteeing Subsidiary shall be
subordinated to the prior payment in full of all Senior Debt of that
Guaranteeing Subsidiary (in the same manner and to the same extent that the
Notes are subordinated to Senior Debt), which shall include all guarantees of
Senior Debt. For purposes of the foregoing, no Indebtedness will be deemed to be
subordinated or junior in right of payment to any Indebtedness solely by virtue
of being unsecured.

     8. NEW YORK LAW TO GOVERN. THIS SUPPLEMENTAL INDENTURE SHALL BE GOVERNED
BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

     9. COUNTERPARTS. The parties may sign any number of copies of this
Supplemental Indenture. Each signed copy shall be an original, but all of them
together represent the same agreement.

     10. EFFECT OF HEADINGS. The Section headings herein are for convenience
only and shall not affect the construction hereof.

     11. THE TRUSTEE. The Trustee shall not be responsible in any manner
whatsoever for or in respect of the validity or sufficiency of this Supplemental
Indenture or for or in respect of the recitals contained herein, all of which
recitals are made solely by the Guaranteeing Subsidiaries and the Company.


                                       E-6



          IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture to be duly executed, all as of the date first above written.

Dated: ______________, ______

                                        L-3 COMMUNICATIONS CORPORATION


                                        By:
                                            ------------------------------------
                                            Name:
                                            Title:

GUARANTEEING SUBSIDIARIES:

[EXISTING GUARANTORS]
[ADDITIONAL GUARANTORS]

Dated: ______________, ______

THE BANK OF NEW YORK,
   as Trustee


By:
    ---------------------------------
    Name:
    Title:


                                       E-7



                                                                       EXHIBIT F

  FORM OF NOTATION ON SENIOR SUBORDINATED NOTE RELATING TO SUBSIDIARY GUARANTEE

          Pursuant to the Indenture (the "Indenture"), dated as of July 29,
2005, among L-3 Communications Corporation, the Guarantors party thereto (each a
"Guarantor" and collectively the "Guarantors") and The Bank of New York, as
trustee (the "Trustee"), each Guarantor (i) has jointly and severally
unconditionally guaranteed (a) the due and punctual payment of the principal of,
and premium, interest and Additional Interest on the Notes, whether at maturity
or an interest payment date, by acceleration, call for redemption or otherwise,
(b) the due and punctual payment of interest on the overdue principal and
premium of, and interest and Additional Interest on the Notes, and (c) in case
of any extension of time of payment or renewal of any Notes or any of such other
Obligations, the same will be promptly paid in full when due in accordance with
the terms of the extension or renewal, whether at stated maturity, by
acceleration or otherwise and (ii) has agreed to pay any and all costs and
expenses (including reasonable attorneys' fees) incurred by the Trustee or any
Holder in enforcing any rights under the Subsidiary Guarantee (as defined in the
Supplemental Indenture). Notwithstanding the foregoing, the Subsidiary Guarantee
of each Guarantor shall be subordinated to the prior payment in full of all
Senior Debt (as defined in the Indenture) of that Guarantor (in the same manner
and to the same extent that the Notes are subordinated to Senior Debt), which
shall include all guarantees of Senior Debt.

          Notwithstanding the foregoing, in the event that the Subsidiary
Guarantee of any Guarantor would constitute or result in a violation of any
applicable fraudulent conveyance or similar law of any relevant jurisdiction,
the liability of such Guarantor under its Subsidiary Guarantee shall be reduced
to the maximum amount permissible under such fraudulent conveyance or similar
law.

          No past, present or future director, officer, employee, agent,
incorporator, stockholder or agent of any Subsidiary of the Company, as such,
shall have any liability for any Obligations of the Company or any Subsidiary of
the Company under the Notes, any Subsidiary Guarantee, the Indenture, any
supplemental indenture delivered pursuant to the Indenture by such Guarantor, or
for any claim based on, in respect of or by reason of such Obligations or their
creation. Each Holder by accepting a Note waives and releases all such
liability.

          The Subsidiary Guarantee shall be binding upon each Guarantor and its
successors and assigns and shall inure to the benefit of the successors and
assigns of the Trustee and the Holders and, in the event of any transfer or
assignment of rights by any Holder or the Trustee, the rights and privileges
herein conferred upon that party shall automatically extend to and be vested in
such transferee or assignee, all subject to the terms and conditions hereof.

          The Subsidiary Guarantee shall not be valid or obligatory for any
purpose until the certificate of authentication on the Note upon which the
Subsidiary Guarantee is noted has been executed by the Trustee under the
Indenture by the manual signature of one of its authorized officers. Capitalized
terms used herein have the meaning assigned to them in the Indenture.


                                       F-1



          IN WITNESS WHEREOF, the Guarantors hereto have caused this Notation on
the 6 3/8% Senior Subordinated Note due 2015 to be duly executed, all as of the
date first above written.

Dated:  ______________, ______

GUARANTEEING SUBSIDIARIES:

[EXISTING GUARANTORS]
[ADDITIONAL GUARANTORS]


                                       F-2