Document:

SUPPLEMENTAL INDENTURE TO BE DELIVERED
                          BY GUARANTEEING SUBSIDIARIES

     Supplemental Indenture (this "Supplemental Indenture"), dated as of
February 20, 2007, among L-3 Communications Holdings, Inc. (or its permitted
successor), a Delaware corporation (the "Company"), each a direct or indirect
subsidiary of the Company signatory hereto (each, a "Guaranteeing Subsidiary",
and collectively, the "Guaranteeing Subsidiaries"), 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 up to $700,000,000 of 3.0% Convertible Contingent Debt
Securities (CODES) due 2035 (the "CODES");

          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 CODES and the Indenture on the terms and conditions set
forth herein (the "Subsidiary Guarantee"); and

          WHEREAS, pursuant to the Indenture, the parties hereto are authorized
to execute and deliver this Supplemental Indenture and the Trustee has
determined that this Supplemental Indenture is in form satisfactory to it.

          NOW THEREFORE, in consideration of the foregoing and for other good
and valuable consideration, the receipt of which is hereby acknowledged, the
Guaranteeing Subsidiaries and the Trustee mutually covenant and agree for the
equal and ratable benefit of the Holders of the CODES 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 CODES
                    (collectively, the "Guarantors" and each, a "Guarantor"),
                    unconditionally guarantees to each Holder of a CODE
                    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 CODES or
                    the Obligations of the Company under the Indenture or the
                    CODES, that:

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

                                       1

                    (ii)  in case of any extension of time for payment or
                          renewal of any CODES 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 A to the Indenture
                    shall be endorsed by an Officer of such Guaranteeing
                    Subsidiary on each CODE 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 CODE 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 CODE
                    on which a Subsidiary Guarantee is endorsed, the Subsidiary
                    Guarantee shall be valid nevertheless.

               (d)  The delivery of any CODE 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, to the extent permitted by
                    applicable law, be unconditional, regardless of the
                    validity, regularity or enforceability of the CODES or the
                    Indenture, the absence of any action to enforce the same,
                    any waiver or consent by any Holder of the CODES 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, to the extent permitted by
                    applicable law, 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
                    Subsidiary Guarantee made pursuant to this Supplemental
                    Indenture will

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                    not be discharged except by complete performance of the
                    Obligations contained in the CODES 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:

                    (iii) the maturity of the Obligations guaranteed hereby may
                          be accelerated as provided in Article 4 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;

                    (iv)  in the event of any declaration of acceleration of
                          such Obligations as provided in Article 4 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; and

                    (v)   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 6 and 9 of the Indenture,
                    nothing contained in the Indenture, this Supplemental
                    Indenture or in the CODES shall prevent (i) any
                    consolidation or merger of any Guaranteeing Subsidiary with
                    or into the Company or any other Guarantor, (ii) 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 or (iii)
                    any merger of a Guarantor with or into with an Affiliate of
                    that Guarantor that has not 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 the domestic non-Guarantor subsidiaries is not
                    increased thereby.

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               (b)  Except as set forth in Article 9 of the Indenture, nothing
                    contained in the Indenture, this Supplemental Indenture or
                    in the CODES shall prevent any consolidation or merger of
                    any Guaranteeing Subsidiary with or into any Person
                    organized under the laws of the United States of America,
                    any state thereof, the District of Columbia or any territory
                    thereof 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 any Person organized under the laws of the United States
                    of America, any state thereof, the District of Columbia or
                    any territory thereof other than the Company or any other
                    Guarantor (in each case, 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 any Person formed by such
                    consolidation, or into which such Guaranteeing Subsidiary
                    shall have been merged, or by any Person which shall have
                    acquired such property, (ii) immediately after giving effect
                    to such consolidation, merger, sale or conveyance no Default
                    or Event of Default exists and (iii) such transaction will
                    only be permitted under the Indenture if it would be
                    permitted under the terms of all of the indentures governing
                    the Outstanding Senior Subordinated Notes as the same are in
                    effect on the date of the Indenture (whether or not those
                    indentures are subsequently amended, waived, modified or
                    terminated or expire and whether or not any of these notes
                    continue to be outstanding).

               (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 Person 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 Person thereupon may
                    cause to be signed any or all of the Subsidiary Guarantees
                    to be endorsed upon the CODES 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

                                        4

                    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. If the assets
                    sold in such sale or other disposition (including by way of
                    merger or consolidation) 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. 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, 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 (including Contingent Interest and
                    Additional Interest, if any) on the CODES and for the other
                    obligations of such Guaranteeing Subsidiary under the
                    Indenture as provided in this Supplemental Indenture.

               (b)  Upon the designation of a Guaranteeing Subsidiary as an
                    Excluded Subsidiary in accordance with the terms of the
                    Indenture and the indentures governing the Outstanding
                    Senior Subordinated Notes as the same are in effect on the
                    date of the Indenture (whether or not those indentures are
                    subsequently amended, waived, modified or terminated or
                    expire and whether or not any of those notes continue to be
                    outstanding), such Guaranteeing Subsidiary shall be released
                    and relieved of all 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 and the indentures governing, the Outstanding
                    Senior Subordinated Notes as the same are in effect on the
                    date of the Indenture (whether or not those indentures are
                    subsequently amended, waived, modified or terminated or
                    expire and whether or not any of those notes continue to be
                    outstanding), 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

                                        5

                    Guarantee shall remain liable for the full amount of
                    principal of and interest on the CODES and for the other
                    obligations of any Guaranteeing Subsidiary under the
                    Indenture as provided herein.

               (c)  Upon any Guarantor being released from its guarantees of,
                    and all pledges and security interests granted in connection
                    with, Indebtedness of the Company or any of its Subsidiaries
                    (other than a Foreign Subsidiary), such Guarantor shall be
                    released and relieved of its obligations under this
                    Supplemental Indenture.

          6. NO RECOURSE AGAINST OTHERS. No past, present or future director,
officer, employee, incorporator, stockholder or agent of any Guaranteeing
Subsidiary, as such, shall have any liability for any obligations of the Company
or any Guaranteeing Subsidiary under the CODES, 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
CODES by accepting a CODE waives and releases all such liability. The waiver and
release are part of the consideration for issuance of the CODES. 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. SUBORDINATION OF SUBSIDIARY GUARANTEES; ANTI-LAYERING. 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. No
Indebtedness shall be deemed to be subordinated or junior in right of payment to
any other Indebtedness solely by virtue of being unsecured.

          8. 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.

                                        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: February 20, 2007                L-3 COMMUNICATIONS HOLDINGS, INC.

                                        By:
                                            ------------------------------------
                                            Name: Christopher C. Cambria
                                            Title: Senior Vice President

Dated: February 20, 2007

Apcom, Inc., a Maryland corporation
Broadcast Sports Inc., a Delaware corporation
D.P. Associates, Inc., a Virginia corporation
Electrodynamics, Inc., an Arizona corporation
gForce Technologies, Inc., a Massachusetts corporation
Henschel Inc., a Delaware corporation
Hygienetics Environmental Services, Inc., a Delaware corporation
Interstate Electronics Corporation, a California corporation
KDI Precision Products, Inc., a Delaware corporation
LinCom Wireless, Inc., a Delaware corporation
L-3 Communications Advanced Laser Systems Technology, Inc., a Florida
corporation
L-3 Communications Aeromet, Inc., an Oregon corporation
L-3 Communications AIS GP Corporation, a Delaware corporation
L-3 Communications Applied Signal and Image Technology, Inc., a Maryland
corporation
L-3 Communications Avionics Systems, Inc., a Delaware corporation
L-3 Communications Avisys Corporation, a Texas corporation
L-3 Communications Aydin Corporation, a Delaware corporation
L-3 Communications CE Holdings, Inc., a Delaware corporation
L-3 Communications Cincinnati Electronics, Inc., an Ohio corporation
L-3 Communications Crestview Aerospace Corporation, a Delaware corporation
L-3 Communications CSI, Inc., a California corporation
L-3 Communications CyTerra Corporation, a Delaware corporation
L-3 Communications Dynamic Positioning and Control Systems, Inc., a California
corporation
L-3 Communications Electron Technologies, Inc., a Delaware corporation
L-3 Communications EO/IR, Inc., a Florida corporation
L-3 Communications EOTech, Inc., a Delaware corporation
L-3 Communications ESSCO, Inc., a Delaware corporation
L-3 Communications Foreign Holdings, Inc., a Delaware corporation
L-3 Communications Government Services, Inc., a Virginia corporation
L-3 Communications ILEX Systems, Inc., a Delaware corporation
L-3 Communications InfraredVision Technology Corporation, a California
corporation
L-3 Communications Investments Inc., a Delaware corporation
L-3 Communications Klein Associates, Inc., a Delaware corporation
L-3 Communications MAS (US) Corporation, a Delaware corporation
L-3 Communications MariPro, Inc., a California corporation
L-3 Communications Mobile-Vision, Inc., a New Jersey corporation
L-3 Communications Nautronix Holdings, Inc., a Delaware corporation
L-3 Communications Nova Engineering, Inc., an Ohio corporation
L-3 Communications SafeView, Inc., a Delaware corporation
L-3 Communications Security and Detection Systems, Inc., a Delaware corporation
L-3 Communications Sonoma EO, Inc., a California corporation
L-3 Communications SSG-Tinsley, Inc., a Delaware corporation
L-3 Communications TCS, Inc., a Delaware corporation
L-3 Communications Tinsley Laboratories, Inc., a California corporation
L-3 Communications Titan Corporation, a Delaware corporation
L-3 Communications Westwood Corporation, a Nevada corporation
MCTI Acquisition Corporation, a Maryland Corporation
Microdyne Communications Technologies Incorporated, a Maryland corporation
Microdyne Corporation, a Maryland corporation
Microdyne Outsourcing Incorporated, a Maryland corporation

MPRI, Inc., a Delaware corporation
Pac Ord Inc., a Delaware corporation
Power Paragon, Inc., a Delaware corporation
SPD Electrical Systems, Inc., a Delaware corporation
SPD Switchgear Inc., a Delaware corporation
SYColeman Corporation, a Florida corporation
Titan Facilities, Inc., a Virginia corporation
Troll Technology Corporation, a California corporation
Wescam Air Ops Inc., a Delaware corporation
Wescam Holdings (US) Inc., a Delaware corporation
Wolf Coach, Inc., a Massachusetts corporation

                                        As Guaranteeing Subsidiaries

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

L-3 Communications Integrated Systems L.P., a Delaware limited partnership

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

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

L-3 Communications Flight Capital LLC, a Delaware limited liability company
L-3 Communications Flight International Aviation LLC, a Delaware limited
liability company
L-3 Communications Vector International Aviation LLC, a Delaware limited
liability company

                                        By: L-3 COMMUNICATIONS VERTEX AEROSPACE
                                        LLC, as Sole Member

                                        By: L-3 COMMUNICATIONS INTEGRATED
                                        SYSTEMS L.P., as Sole Member

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

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

L-3 Communications Vertex Aerospace LLC, a Delaware limited liability company

                                        By: L-3 COMMUNICATIONS INTEGRATED
                                        SYSTEMS L.P., as Sole Member

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

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

Wescam Air Ops LLC, a Delaware limited liability company

                                        By: L-3 COMMUNICATIONS EO/IR, INC.,
                                        as Sole Member

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

Wescam LLC, a Delaware limited liability company

                                        By: L-3 COMMUNICATIONS CORPORATION,
                                        as Sole Member

                                        By:
                                            ------------------------------------
                                        Name: Christopher C. Cambria
                                        Title: Senior Vice President

L-3 Communications Germany Holdings, LLC, a Delaware limited liability company

                                        By: L-3 COMMUNICATIONS CORPORATION,
                                        as Sole Member

                                        By:
                                            ------------------------------------
                                        Name: Christopher C. Cambria
                                        Title: Senior Vice President

Dated: February 20, 2007                THE BANK OF NEW YORK,
                                        as Trustee

                                        By:
                                            ------------------------------------
                                            Name:
                                            Title: Assistant Vice President

      NOTATION ON SENIOR SUBORDINATED NOTE RELATING TO SUBSIDIARY GUARANTEE

          Pursuant to the Supplemental Indenture (the "Supplemental Indenture")
dated as of February 20, 2007 among L-3 Communications Holdings, Inc., 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 interest (including Contingent Interest and
Additional Interest, if any) on the CODES, 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 interest (including
Contingent Interest and Additional Interest, if any) on the CODES, and (c) in
case of any extension of time of payment or renewal of any CODES 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). This Guarantee is subordinated to the Senior Debt of
each Guarantor to extent set forth in Article 13 of the Indenture.

          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 Guarantor, as such, shall have any
liability for any Obligations of the Company or any Guarantor under the CODES,
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 CODE 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 CODE 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, dated as
of July 29, 2005, among L-3 Communications Holdings, Inc., the Guarantors party
thereto and the Trustee.

Dated: February 20, 2007

Apcom, Inc., a Maryland corporation
Broadcast Sports Inc., a Delaware corporation
D.P. Associates, Inc., a Virginia corporation
Electrodynamics, Inc., an Arizona corporation
gForce Technologies, Inc., a Massachusetts corporation
Henschel Inc., a Delaware corporation
Hygienetics Environmental Services, Inc., a Delaware corporation
Interstate Electronics Corporation, a California corporation
KDI Precision Products, Inc., a Delaware corporation
LinCom Wireless, Inc., a Delaware corporation
L-3 Communications Advanced Laser Systems Technology, Inc., a Florida
corporation
L-3 Communications Aeromet, Inc., an Oregon corporation
L-3 Communications AIS GP Corporation, a Delaware corporation
L-3 Communications Applied Signal and Image Technology, Inc., a Maryland
corporation
L-3 Communications Avionics Systems, Inc., a Delaware corporation
L-3 Communications Avisys Corporation, a Texas corporation
L-3 Communications Aydin Corporation, a Delaware corporation
L-3 Communications CE Holdings, Inc., a Delaware corporation
L-3 Communications Cincinnati Electronics, Inc., an Ohio corporation
L-3 Communications Crestview Aerospace Corporation, a Delaware corporation
L-3 Communications CSI, Inc., a California corporation
L-3 Communications CyTerra Corporation, a Delaware corporation
L-3 Communications Dynamic Positioning and Control Systems, Inc., a California
corporation
L-3 Communications Electron Technologies, Inc., a Delaware corporation
L-3 Communications EO/IR, Inc., a Florida corporation
L-3 Communications EOTech, Inc., a Delaware corporation
L-3 Communications ESSCO, Inc., a Delaware corporation
L-3 Communications Foreign Holdings, Inc., a Delaware corporation
L-3 Communications Government Services, Inc., a Virginia corporation
L-3 Communications ILEX Systems, Inc., a Delaware corporation
L-3 Communications InfraredVision Technology Corporation, a California
corporation
L-3 Communications Investments Inc., a Delaware corporation
L-3 Communications Klein Associates, Inc., a Delaware corporation
L-3 Communications MAS (US) Corporation, a Delaware corporation
L-3 Communications MariPro, Inc., a California corporation
L-3 Communications Mobile-Vision, Inc., a New Jersey corporation
L-3 Communications Nautronix Holdings, Inc., a Delaware corporation
L-3 Communications Nova Engineering, Inc., an Ohio corporation
L-3 Communications SafeView, Inc., a Delaware corporation
L-3 Communications Security and Detection Systems, Inc., a Delaware corporation
L-3 Communications Sonoma EO, Inc., a California corporation
L-3 Communications SSG-Tinsley, Inc., a Delaware corporation
L-3 Communications TCS, Inc., a Delaware corporation
L-3 Communications Tinsley Laboratories, Inc., a California corporation
L-3 Communications Titan Corporation, a Delaware corporation
L-3 Communications Westwood Corporation, a Nevada corporation
MCTI Acquisition Corporation, a Maryland Corporation
Microdyne Communications Technologies Incorporated, a Maryland corporation
Microdyne Corporation, a Maryland corporation

Microdyne Outsourcing Incorporated, a Maryland corporation
MPRI, Inc., a Delaware corporation
Pac Ord Inc., a Delaware corporation
Power Paragon, Inc., a Delaware corporation
SPD Electrical Systems, Inc., a Delaware corporation
SPD Switchgear Inc., a Delaware corporation
SYColeman Corporation, a Florida corporation
Titan Facilities, Inc., a Virginia corporation
Troll Technology Corporation, a California corporation
Wescam Air Ops Inc., a Delaware corporation
Wescam Holdings (US) Inc., a Delaware corporation
Wolf Coach, Inc., a Massachusetts corporation

                                        As Guaranteeing Subsidiaries

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

L-3 Communications Integrated Systems L.P., a Delaware limited partnership

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

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

L-3 Communications Flight Capital LLC, a Delaware limited liability company
L-3 Communications Flight International Aviation LLC, a Delaware limited
liability company
L-3 Communications Vector International Aviation LLC, a Delaware limited
liability company

                                        By: L-3 COMMUNICATIONS VERTEX AEROSPACE
                                        LLC, as Sole Member

                                        By: L-3 COMMUNICATIONS INTEGRATED
                                        SYSTEMS L.P., as Sole Member

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

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

L-3 Communications Vertex Aerospace LLC, a Delaware limited liability company

                                        By: L-3 COMMUNICATIONS INTEGRATED
                                        SYSTEMS L.P., as Sole Member

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

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

Wescam Air Ops LLC, a Delaware limited liability company

                                        By: L-3 COMMUNICATIONS EO/IR, INC.,
                                        as Sole Member

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

Wescam LLC, a Delaware limited liability company

                                        By: L-3 COMMUNICATIONS CORPORATION,
                                        as Sole Member

                                        By:
                                            ------------------------------------
                                        Name: Christopher C. Cambria
                                        Title: Senior Vice President

L-3 Communications Germany Holdings, LLC, a Delaware limited liability company

                                        By: L-3 COMMUNICATIONS CORPORATION, as
                                        Sole Member

                                        By:
                                            ------------------------------------
                                        Name: Christopher C. Cambria
                                        Title: Senior Vice PresidentAMENDED AND RESTATED 1998 DIRECTORS STOCK OPTION PLAN
                          FOR NON-EMPLOYEE DIRECTORS OF
                        L-3 COMMUNICATIONS HOLDINGS, INC.

1.   Purpose of the Plan

     The 1998 Directors Stock Option Plan for Non-Employee Directors of L-3
Communications Holdings, Inc. (the "Plan") is designed:

     (a) to promote the long-term financial interests and growth of L-3
Communications Holdings, Inc. (the "Corporation") and its Subsidiaries by
attracting and retaining Non-Employee Directors with the training, experience
and ability to enable them to make a substantial contribution to the success of
the Corporation's business; and

     (b) to further the alignment of interests of Non-Employee Directors with
those of the stockholders of the Corporation through opportunities for increased
stock, or stock-based, ownership in the Corporation.

2.   Definitions

     As used in the Plan, the following words shall have the following meanings:

     (a) "Board of Directors" means the Board of Directors of the Corporation.

     (b) "Code" means the Internal Revenue Code of 1986, as amended.

     (c) "Committee" means the Compensation Committee of the Board of Directors.

     (d) "Common Stock" or "Share" means common stock, par value $.01 per share
of the Corporation.

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

     (f) "Fair Market Value" means, unless otherwise defined in an Option
Agreement, the closing price of the Common Stock as reported on the composite
tape of New York Stock Exchange issues (or if, at the date of determination, the
Common Stock is not so listed or if the principal market on which it is traded
is not the New York Stock Exchange, such other reporting system as shall be
selected by the Committee) on the relevant date, or, if no sale of the Common
Stock is reported for that date, the next preceding day for which there is a
reported sale.

     (g) "Non-Employee Director" means a director of the Corporation who is not
(i) an employee of the Corporation or any of its Subsidiaries, (ii) a director,
officer or employee of any entity that owns, beneficially or of record, directly
or indirectly, 10% or more of the Common Stock outstanding on the date of grant
of the Option or (iii) a person that owns, beneficially or of record, directly
or indirectly, 10% or more of the Common Stock outstanding on the date of grant
of the Option.

                                                                               1

     (h) "Option Agreement" means an agreement of the Corporation for the
benefit of a Participant that sets forth or incorporates by reference the terms,
conditions and limitations applicable to a grant of Options pursuant to the
Plan.

     (i) "Option" means an option to purchase shares of the Common Stock granted
to a Participant pursuant to Section 6, which will not be an "incentive stock
option" (within the meaning of Section 422 of the Code).

     (j) "Participant" means a Non-Employee Director to whom one or more grants
of Options have been made and such grants have not all been forfeited or
terminated under the Plan.

     (k) "Subsidiary" shall mean any corporation in an unbroken chain of
corporations beginning with the Corporation if each of the corporations, or
group of commonly controlled corporations, other than the last corporation in
the unbroken chain then owns stock possessing 50% or more of the total combined
voting power of all classes of stock in one of the other corporations in such
chain.

3.   Stock Subject to the Plan

     (a) Subject to the provisions of Section 8 and this Section 3, the maximum
number of shares of Common Stock in respect of which Options may be granted is
400,000. If and to the extent that an Option shall expire, terminate or be
cancelled for any reason without having been exercised, the shares of Common
Stock subject to such expired, terminated or cancelled portion of the Option
shall again become available for purposes of the Plan.

     (b) Shares of Common Stock deliverable under the terms of the Plan may be,
in whole or in part, authorized and unissued shares of Common Stock, or issued
shares of Common Stock held in the Corporation's treasury, or both.

     (c) The Corporation shall at all times reserve a number of shares of Common
Stock (authorized and unissued shares of Common Stock, issued shares of Common
Stock held in the Corporation's treasury, or both) equal to the maximum number
of shares of Common Stock that may be subject to outstanding Option grants and
future Option grants under the Plan.

4.   Administration of the Plan

     (a) The Plan shall be administered by the Committee or a subcommittee
appointed by the Committee. The Committee may adopt its own rules of procedure,
and action of a majority of the members of the Committee taken at a meeting, or
action taken without a meeting by unanimous written consent, shall constitute
action by the Committee. The Committee shall have the power and authority to
administer, construe and interpret the Plan, to make rules for carrying it out
and to make changes in such rules. Any such interpretations, rules and
administration shall be consistent with the basic purposes of the Plan.

     (b) As to decisions in respect of Participants who are subject to Section
16 of the Exchange Act, the participating members of the Committee administering
the Plan shall include only those members of the Committee who are non-Employee
Directors (as defined in Rule 16b-

                                                                               2

3 promulgated under the Exchange Act).

     (c) Unless in contravention to any laws, rules and regulations governing
the Plan, including the Exchange Act, the Committee may delegate to the Chief
Executive Officer and to other senior officers of the Corporation its duties
under the Plan subject to such conditions and limitations as the Committee shall
prescribe; provided that under no circumstances may the Chief Executive Officer
or any other senior officer be delegated the authority to approve or award the
grant of an Option, except as permitted under New York and Delaware law.

     (d) The Committee may employ attorneys, consultants, accountants,
appraisers, brokers or other persons in respect of the administration of the
Plan, who may be employees of the Corporation or outside advisers to the
Corporation. The Committee, the Corporation, and the officers and directors of
the Corporation shall be entitled to rely upon the advice, opinions or
valuations of any such persons. All actions taken and all interpretations and
determinations made by the Committee in good faith shall be final and binding
upon all Participants, the Corporation and all other interested persons. No
member of the Committee shall be personally liable for any action, determination
or interpretation made in good faith with respect to the Plan or Option grants,
and all members of the Committee shall be fully protected, indemnified and held
harmless by the Corporation with respect to any such action, determination or
interpretation.

5.   Eligibility

     Option grants may be made under this Plan only to Non-Employee Directors of
the Corporation. The terms, conditions and limitations of each Option grant
under the Plan shall be set forth or incorporated by reference in an Option
Agreement, in a form approved by the Committee, consistent, however, with the
terms of the Plan; provided, however, that such Option Agreement shall contain
or incorporate by reference provisions dealing with the treatment of Option
grants in the event of the termination, death or disability of a Participant,
and may also include provisions concerning the treatment (including acceleration
of vesting) of Option grants in the event of a change of control of the
Corporation.

6.   Grants

     (a) Non-Employee Directors shall receive Option grants (each, a "Grant") at
such times and for such number of shares of Common Stock as shall be determined
from time to time by the Board of Directors (and/or the Committee to the extent
such authority is delegated thereto in whole or in part by the Board of
Directors).

     (b) The Options contained in each Grant shall be subject to vesting in
three equal annual installments on the first three anniversaries of the grant
date, such that 1/3 of the shares of Common Stock contained in such Grant shall
vest on the first anniversary of the date of grant, so long as the Participant
has had continuous service as a Non-Employee Director of the Corporation through
the first anniversary, 1/3 of the shares of Common Stock contained in such Grant
shall vest on the second anniversary on the date of grant so long as the
Participant has had continuous service as a Non-Employee Director of the
Corporation through the second anniversary, and 1/3 of the shares of Common
Stock contained in such Grant shall vest on the third anniversary on the date of
grant so long as the Participant has had continuous service as a Non-Employee
Director of the Corporation through the third anniversary. All vested Options

                                                                               3

shall be exercisable through the tenth anniversary of the grant date, after
which such unexercised Options shall expire. All Options shall have an exercise
price equal to the Fair Market Value of the Common Stock on the grant date.

     (c) At or prior to the time of the grant of each Option the Committee shall
determine, and shall include or incorporate by reference in the Option
Agreement, such other conditions or restrictions on the grant or exercise of the
Option as the Committee deems appropriate. In addition to other restrictions
contained in the Plan, an Option granted under this Section 6, may not be
exercised more than ten years after the date it is granted.

     (d) The exercise price of an Option shall be paid in full at or prior to
the time of the delivery of shares of Common Stock (i) in cash, (ii) through the
surrender of previously acquired shares of Common Stock having a Fair Market
Value on the exercise date equal to the exercise price of the Option, (iii)
through the withholding by the Company (at the election of the Participant) of
shares of Common Stock (that would otherwise be issuable upon the exercise
price) having a Fair Market Value on the exercise date equal to the exercise
price of the Option, (iv) by check or (v) by a combination of (i), (ii), (iii)
and (iv). If shares of Common Stock are surrendered by the Participant or
withheld by the Company, the Company shall be permitted to withhold such amounts
as may then be required by the Code or applicable regulations thereunder, as
provided in Section 11.

7.   Limitations and Conditions

     (a) No Options shall be granted under the Plan beyond ten years after the
effective date of the Plan, but the terms of Options granted on or before the
expiration of the Plan shall extend beyond such expiration, as provided in
Section 6(b) above. At the time an Option is granted or amended or the terms or
conditions of an Option are changed, the Committee may provide for limitations
or conditions on such Grant.

     (b) Nothing contained herein shall affect the right of the Corporation or
its directors or stockholders to remove any Non-Employee Director in accordance
with the Certificate of Incorporation, By-laws of the Corporation or applicable
law.

     (c) Other than by will or by the laws of descent and distribution, no
benefit under the Plan shall be subject in any manner to anticipation,
alienation, sale, transfer, assignment, pledge, encumbrance, or charge, and any
attempt to do so shall be void, except that Options may be transferred to and
exercised by a family member or family members of a Participant, or transferred
to an irrevocable trust or trusts (or other similar estate planning entity or
entities) established for the benefit of a Participant and/or one or more of the
Participant's family members. No such benefit shall, prior to receipt thereof by
the Participant, be in any manner or subject to attachment, satisfaction or
discharge of the debts, contracts, liabilities, engagements, or obligations
arising in respect of torts of the Participant. The designation of a beneficiary
hereunder shall not constitute a transfer prohibited by the foregoing
provisions.

     (d) Participants shall not be, and shall not have any of the rights or
privileges of, stockholders of the Corporation in respect of any shares of
Common Stock purchasable in connection with any Option grant unless and until
such Option has been exercised in accordance with the terms of this Plan and any
applicable Option Agreement.

                                                                               4

     (e) During the lifetime of a Participant, an election as to benefits and/or
the exercise of Options may be made only by such Participant or by his or her
guardian, trustee or other legal representative, except that grants of Options
may be transferred to and exercised by a family member or family members of a
Participant, or transferred to an irrevocable trust or trusts (or other similar
estate planning entity or entities) established for the benefit of a Participant
and/or one or more of the Participant's family members.

     (f) Absent express provisions to the contrary, any grant of Options under
this Plan shall not be deemed compensation for purposes of computing benefits or
contributions under any retirement plan of the Corporation or its Subsidiaries
and shall not affect any benefits under any other benefit plan of any kind now
or subsequently in effect under which the availability or amount of benefits is
related to level of compensation. This Plan is not a "Retirement Plan" or
"Welfare Plan" under the Employee Retirement Income Security Act of 1974, as
amended.

     (g) Unless the Committee determines otherwise, no benefit, Option or other
promise under the Plan shall be secured by any specific assets of the
Corporation or any of its Subsidiaries, nor shall any assets of the Corporation
or any of its Subsidiaries be designated as attributable or allocated to the
satisfaction of the Corporation's obligations under the Plan or any applicable
Option Agreement.

8.   Adjustments

     In the event of any change in the outstanding Common Stock by reason of a
stock split, spin-off, stock dividend, stock combination or reclassification,
recapitalization or merger, change of control, or similar event (including,
without limitation, an extraordinary cash dividend), the Committee shall adjust
appropriately and equitably the number of Shares subject to the Plan and
available for or covered by Option grants and exercise prices related to
outstanding Option grants and make such other revisions to outstanding Option
grants as it deems, in its sole discretion, are equitably required.

                                                                               5

9.   Merger, Consolidation, Exchange, Acquisition, Liquidation or Dissolution

     In its absolute discretion, and on such terms and conditions as it deems
appropriate, coincident with or after the grant of any Option, the Committee may
provide that such Option cannot be exercised after the merger or consolidation
of the Corporation into another corporation, the exchange of all or
substantially all of the assets of the Corporation for the securities of another
corporation, the acquisition by another corporation of 80% or more of the
Corporation's then outstanding shares of voting stock or the recapitalization,
reclassification, liquidation or dissolution of the Corporation, and if the
Committee so provides, it shall also provide, either by the terms of such Option
or by a resolution adopted prior to the occurrence of such merger,
consolidation, exchange, acquisition, recapitalization, reclassification,
liquidation or dissolution, that, for a period of at least thirty (30) days
prior to such event, such Option (whether or not vested) shall be exercisable as
to all Shares subject thereto, notwithstanding anything to the contrary herein
(but subject to the provisions of Section 6(b)) and that, upon the occurrence of
such event, such Option shall terminate and be of no further force or effect;
provided, however, that the Committee may also provide, in its absolute
discretion, that even if the Option shall remain exercisable after any such
event, from and after such event, any such Option shall be exercisable only for
the kind and amount of securities and/or other property, or the cash equivalent
thereof, receivable as a result of such event by the holder of a number of
shares of Common Stock for which such Option could have been exercised
immediately prior to such event.

10.  Amendment and Termination

     (a) The Committee shall have the authority to make such amendments to any
terms and conditions applicable to outstanding Option grants as are consistent
with this Plan provided that, except for adjustments under Section 8 or 9
hereof, no such action shall modify such Option grant in a manner adverse to the
Participant without the Participant's consent.

     (b) The Board of Directors may at any time amend, suspend or terminate this
Plan, subject to any stockholder approval that may be required under applicable
law. Notwithstanding the foregoing, no such action, other than an action under
Section 8 or 9 hereof, may be taken that would change the exercise price of
outstanding Options, change the requirements relating to the Committee, or
(without obtaining stockholder approval) extend the term of the Plan.

11.  Withholding Taxes

     The Corporation shall have the right to deduct from any cash payment made
under the Plan any federal, state or local income or other taxes required by law
to be withheld with respect to such payment. It shall be a condition to the
obligation of the Corporation to deliver shares of Common Stock upon the
exercise of an Option that the Participant pay to the Corporation such amount as
may be requested by the Corporation for the purpose of satisfying any liability
for such withholding taxes at or prior to the time of the delivery of such
shares of Common Stock. Any Option Agreement may provide that the Participant
may elect, in accordance with any conditions set forth in such Option Agreement,
to pay a portion or all of such withholding taxes in shares of Common Stock.

                                                                               6

12.  Effective Date and Termination Dates

     The Plan shall be effective on and as of the date of its approval by the
Board of Directors of the Corporation and shall terminate ten years later,
subject to earlier termination by the Board of Directors pursuant to Section 10.

13.  Governing Law

     The validity, interpretation, construction and performance of this Plan and
all Option Agreements hereunder shall be governed by, and construed in
accordance with, the laws of the State of New York.

14.  Severability

     If any provisions of this Plan or any applicable Option Agreement shall be
held by a court of competent jurisdiction to be invalid or unenforceable, the
remaining provisions hereof shall continue to be fully effective.

                                                                               7

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