Document:

<PAGE>

Exhibit 10(o)

                          PURCHASE AND SALE AGREEMENT

                         Dated as of November 28, 2001

                                     among

                         THE ORIGINATORS NAMED HEREIN,

                           U.S. STEEL RECEIVABLES LLC

                                      and

                            UNITED STATES STEEL LLC,
                            as the initial Servicer
<PAGE>

                               TABLE OF CONTENTS
                               -----------------

<TABLE>
<CAPTION>
                                                                                             PAGE
                                   ARTICLE I

                         AGREEMENT TO PURCHASE AND SELL
<S>                                                                                           <C>
1.1. Agreement to Purchase and Sell...........................................................2
1.2. Timing of Purchases......................................................................3
1.3. Consideration for Purchases..............................................................3
1.4. Purchase and Sale Termination Date.......................................................3
1.5. Intention of the Parties.................................................................3

                                   ARTICLE II

                          CALCULATION OF PURCHASE PRICE

2.1. Calculation of Purchase Price .......................................................... 4

                                  ARTICLE III

                          CONTRIBUTION OF RECEIVABLES;
                           PAYMENT OF PURCHASE PRICE

3.1. Contribution of Receivables .............................................................5
3.2. Initial Purchase Price Payment...........................................................5
3.3. Subsequent Purchase Price Payments.......................................................5
3.4. Settlement as to Specific Receivables....................................................6
3.5. Reconveyance of Receivables..............................................................7

                                   ARTICLE IV

                            CONDITIONS OF PURCHASES

4.1. Conditions Precedent to Initial Purchase.................................................7
4.2. Certification as to Representations and Warranties.......................................9
4.3. Addition of Originators..................................................................9
</TABLE>

                                   ARTICLE V

                                       i
<PAGE>

<TABLE>
               REPRESENTATIONS AND WARRANTIES OF THE ORIGINATORS
<S>                                                                                          <C>
5.1. Company Existence and Power ............................................................10
5.2. Company and Governmental Authorization: Contravention ................................. 10
5.3. Enforceability .........................................................................10
5.4. Valid Sale or Contribution .............................................................10
5.5. Litigation .............................................................................10
5.6. Accuracy of Information.................................................................11
5.7. Location ...............................................................................11
5.8. Bulk Sales Act..........................................................................11
5.9. Financial Condition.....................................................................11
5.10. Margin Regulations.....................................................................11
5.11. Quality of Title.......................................................................12
5.12. Trade Names............................................................................12
5.13. Taxes..................................................................................12
5.14. Licenses and Labor Controversie........................................................12
5.15. Reliance on Separate Legal Identity....................................................13
5.16. Purchase Price.........................................................................13
5.17. Investment Company Act.................................................................13

                                   ARTICLE VI

                          COVENANTS OF THE ORIGINATORS

6.1. Affirmative Covenants...................................................................13
6.2. Reporting Requirements..................................................................16
6.3. Negative Covenants......................................................................16

                                  ARTICLE VII

                      ADDITIONAL RIGHTS AND OBLIGATIONS IN
                           RESPECT OF THE RECEIVABLES

7.1. Rights of the Company...................................................................17
7.2. Responsibilities of Each Originator ....................................................18
7.3. Further Action Evidencing Purchases.....................................................18
7.4. Application of Collections..............................................................19

                                  ARTICLE VIII

                      PURCHASE AND SALE TERMINATION EVENTS

8.1. Purchase and Sale Termination Events....................................................19
</TABLE>

                                       ii
<PAGE>

<TABLE>
<S>                                                                                          <C>
8.2. Remedies................................................................................20

                                   ARTICLE IX

                                INDEMNIFICATION

9.1. Indemnities by the Originators .........................................................21

                                   ARTICLE X

                                 MISCELLANEOUS

10.1. Amendments, etc........................................................................22
10.2. Notices, etc...........................................................................23
10.3. No Waiver; Cumulative Remedies.........................................................23
10.4. Binding Effect; Assignability..........................................................23
10.5. Governing Law..........................................................................23
10.6. Costs, Expenses and Taxes .............................................................23
10.7. Submission to Jurisdiction.............................................................24
10.8. Waiver of Jury Trial...................................................................24
10.9. Captions and Cross References; Incorporation by Reference .............................24
10.10. Execution in Counterparts ............................................................25
10.11. Acknowledgment and Agreement .........................................................25

                                   SCHEDULES

SCHEDULE 5.12 Trade Names

                                    EXHIBITS
                                    --------

EXHIBIT A     Form of Purchase Report

EXHIBIT B     Form of Company Note

EXHIBIT C     Form of Joinder Agreement
</TABLE>

                                      iii
<PAGE>

                          PURCHASE AND SALE AGREEMENT

     THIS PURCHASE AND SALE AGREEMENT (as amended, supplemented or otherwise
modified from time to time, this "Agreement"), dated as of November 28, 2001, is
                                  ---------
among UNITED STATES STEEL LLC ("USS"), a Delaware limited liability company, as
                                ---
initial Servicer (in such capacity, the "Servicer") and as an Originator (USS,
                                         --------
and together with each other Person that is or from time to time becomes an
Originator pursuant to Section 4.3 hereof, collectively, the "Originators" and
                       -----------                            -----------
each, individually, an "Originator") and U.S. STEEL RECEIVABLES LLC, a Delaware
                        ----------
limited liability company (the "Company"), as purchaser and contributee.
                                -------

                                  Definitions
                                  -----------

     Unless otherwise indicated, certain terms that are capitalized and used
throughout this Agreement are defined in Exhibit I to the Amended and Restated
Receivables Purchase Agreement of even date herewith (as amended, supplemented
or otherwise modified from time to time, the "Receivables Purchase Agreement"),
                                              ------------------------------
among the Company, USS, as initial Servicer, the various CP Conduit Purchasers
and Funding Agents from time to time party thereto and The Bank of Nova Scotia,
as Collateral Agent.

                                   Background
                                   ----------

     1. The Company is a special purpose limited liability company, all of the
membership interests of which are wholly-owned by USS.

     2. In order to finance their respective businesses, the Originators wish to
sell certain Receivables and Related Rights from time to time to the Company,
and the Company is willing, on the terms and subject to the conditions set forth
herein, to purchase such Receivables and Related Rights from such Originators.

     3. The Company intends to sell to Collateral Agent (for the benefit of the
Purchasers) an undivided variable percentage interest in its Receivables and
Related Rights pursuant to the Receivables Purchase Agreement in order to
finance its purchases of certain Receivables and Related Rights hereunder.

     NOW, THEREFORE, in consideration of the premises and the mutual agreements
herein contained, the parties hereto agree as follows:
<PAGE>

                                   ARTICLE I

                         AGREEMENT TO PURCHASE AND SELL

     1.1. Agreement to Purchase and Sell. On the terms and subject to the
          ------------------------------
conditions set forth in this Agreement (including Article IV), and in
                                                  ----------
consideration of the Purchase Price, each Originator agrees to sell to the
Company, and does hereby sell to the Company (subject to the interest created in
favor of Liberty Street Funding Corp., as issuer under the terms of the Original
Agreement (as defined in the Receivables Purchase Agreement) until the Original
Agreement Outstanding Amounts (as defined in the Receivables Purchase Agreement)
have been paid in full), and the Company agrees to purchase from such
Originator, and does hereby purchase from such Originator, without recourse
(except as otherwise provided herein) and without regard to collectibility, all
of such Originator's right, title and interest in and to:

          (a) each Receivable of such Originator that existed and was owing to
     such Originator as of the close of such Originator's business on November
     28, 2001 (the "Closing Date") (other than the Receivables and Related
                    ------------
     Rights contributed by USS to the Company pursuant to Sections 3.1, 3.2 and
                                                          ------------  ---
     3.3 (the "Contributed Receivables"));
     ---       -----------------------
          (b) each Receivable created or originated by such Originator from the
     close of such Originator's business on the Closing Date to and including
     the Purchase and Sale Termination Date;

          (c) all rights to, but not the obligations under, all Related
     Security;

          (d) all monies due or to become due with respect to any of the
     foregoing;

          (e) all books and records related to any of the foregoing;

          (f) all proceeds thereof (as defined in the applicable UCC) received
     on or after the date hereof including, without limitation, all funds which
     either are received by such Originator, the Company or the Servicer from or
     on behalf of the Obligors in payment of any amounts owed (including,
     without limitation, finance charges, interest and all other charges) in
     respect of Receivables, or are applied to such amounts owed by the Obligors
     (including, without limitation, insurance payments, if any, that such
     Originator or the Servicer (if other than Originator) applies in the
     ordinary course of its business to amounts owed in respect of any
     Receivable); and

          (g) all right, title and interest (but not obligations) in and to any
     deposit accounts or securities accounts (as such terms are defined in the
     applicable UCC) into which any Collections or other proceeds with respect
     to such Receivables may be deposited, and any related investment property
     (as such term is defined in the applicable UCC).

                                       2
<PAGE>

All purchases and contributions hereunder shall be made without recourse, but
shall be made pursuant to and in reliance upon the representations, warranties
and covenants of each Originator set forth in this Agreement and each other
Transaction Document. The Company's foregoing commitment to purchase such
Receivables and the proceeds and rights described in subsections (c) through (g)
                                                     ----------- ---         ---
of this Section 1.1 (collectively, the "Related Rights") is herein called the
        -----------                     --------------
"Purchase Facility."
 -----------------

     1.2. Timing of Purchases.
          -------------------

     (a) Closing Date Purchases. Each Originator's entire right, title and
         ----------------------
interest in (A) (i) each Receivable that existed and was owing to Originator as
of the close of such Originator's business on the Closing Date (other than the
Contributed Receivables), and (ii) all Receivables hereafter existing or coming
into existence, and (B) all Related Rights with respect thereto shall be deemed
to have been sold to the Company on the Closing Date.

     (b) Regular Purchases. After the Closing Date, each Receivable created or
         -----------------
originated by each Originator and described in Section 1.1(b) hereof and all
                                               --------------
Related Rights shall be purchased and owned by the Company (without any further
action) upon the creation or origination of such Receivable.

     1.3. Consideration for Purchases. On the terms and subject to the
          ---------------------------
conditions set forth in this Agreement, the Company agrees to make all Purchase
Price payments to the respective Originators, and to reflect all contributions,
in accordance with Article III.
                   -----------

     1.4. Purchase and Sale Termination Date. The "Purchase and Sale Termination
          ----------------------------------       -----------------------------
Date" shall be the earlier to occur of (a) the date of the termination of this
----
Agreement pursuant to Section 8.2 and (b) the Payment Date which is thirty (30)
                      -----------
days following the day on which the Servicer shall have given notice to the
Company that the Originators desire to terminate this Agreement.

     As used herein, "Payment Date" means (i) the Closing Date and (ii) each
                      ------------
Business Day thereafter that the Originators are open for business.

     1.5. Intention of the Parties. It is the express intent of the parties
          ------------------------
hereto that the transfers of the Receivables and Related Rights by each
Originator to the Company, as contemplated by this Agreement be, and be treated
as, sales or contributions, as applicable, and not as loans secured by the
Receivables and Related Rights. If, however, notwithstanding the intent of the
parties, such transfers are deemed to be loans, such Originator hereby grants to
the Company a security interest in all of such Originator's right, title and
interest in and to the Receivables and the Related Rights now existing and
hereafter created, all monies due or to become due and all amounts received with
respect thereto, and all proceeds thereof, to secure all of such Originator's
obligations hereunder.

                                       3
<PAGE>

                                   ARTICLE II

                         CALCULATION OF PURCHASE PRICE

     2.1. Calculation of Purchase Price. On the fifth Business Day after the
          -----------------------------
last day of each calendar month (the "Servicer Report Date"), the Servicer shall
                                      --------------------
deliver to the Company, each Funding Agent and each Originator a report in
substantially the form of Exhibit A (each such report being herein called a
                          ---------
"Purchase Report") with respect to the matters set forth therein relating to
 ---------------
purchased Receivables:

          (a) in existence on the Closing Date (in the case of the Purchase
     Report to be delivered on the Closing Date), or

          (b) coming into existence during the period commencing on the Servicer
     Report Date immediately preceding such Servicer Report Date to (but not
     including) such Servicer Report Date (in the case of each subsequent
     Purchase Report).

The "Purchase Price" (to be paid to each Originator in accordance with the terms
of Article III) for the Receivables and the Related Rights that are purchased
hereunder shall be determined in accordance with the following formula:

     PP = OB X FMVD

     where:
     ------

     PP = Purchase Price for each Receivable as calculated on the relevant
          Payment Date.

     OB = the Outstanding Balance of such Receivable.

     FMVD =Fair Market Value Discount, as measured on such Payment Date, which
           is equal to the quotient (expressed as percentage) of (a) one divided
           by (b) the sum of (i) one, plus (ii) the product of(A) the Prime Rate
           on such Payment Date, and (B) a fraction, the numerator of which is
           the Days' Sales Outstanding (calculated as of the last day of the
           calendar month next preceding such Payment Date) and the denominator
           of which is 365.

     "Prime Rate" means a per annum rate equal to the "prime rate" as published
      ----------          ---------
in the "Money Rates" section of The Wall Street Journal or such other
publication as determined by the Funding Agents in their discretion.

                                       4
<PAGE>

                                  ARTICLE III

                          CONTRIBUTION OF RECEIVABLES;
                           PAYMENT OF PURCHASE PRICE

     3.1. Contribution of Receivables. On the Closing Date, USS shall, and
          ---------------------------
hereby does, contribute to the capital of the Company, Receivables and Related
Rights with respect thereto consisting of each Receivable of USS that existed
and was owing to USS on the Closing Date, beginning with the oldest of such
Receivables and continuing chronologically thereafter, and all or an undivided
interest in the most recent of such contributed Receivables such that the
aggregate Outstanding Balance of all such contributed Receivables shall be equal
to $10,000,000.

     3.2. Initial Purchase Price Payment. On the terms and subject to the
          ------------------------------
conditions set forth in this Agreement, the Company agrees to pay to each
Originator the Purchase Price for the purchase of Receivables to be made on the
Closing Date (other than Contributed Receivables), (i) partially in cash in the
amount of the proceeds of the purchase made by the Purchasers on the Closing
Date under the Receivables Purchase Agreement, and (ii) partially (A) in the
case of USS, as an Originator, by automatically accepting (and USS, without
further action, other than any applicable company formalities in connection
therewith, shall make and shall be deemed to have made) a capital contribution
from USS to the Company of any Receivables and Related Rights transferred by USS
to the Company on such date in excess of the portion of the Purchase Price for
which the Company has available cash, and (B) in the case of all other
Originators, if any, by issuing a promissory note in the form of Exhibit B to
                                                                 ---------
such Originator with an initial principal balance equal to the remaining
Purchase Price (as each such promissory note may be amended, supplemented,
indorsed or otherwise modified from time to time, together with all promissory
notes issued from time to time in substitution therefor or renewal thereof in
accordance with the Transaction Documents, being herein called the "Company
                                                                    -------
Note").
----

     3.3. Subsequent Purchase Price Payments. On each Business Day falling after
          ----------------------------------
the Closing Date and on or prior to the Purchase and Sale Termination Date, on
the terms and subject to the conditions set forth in this Agreement, the Company
shall pay to each Originator the Purchase Price for the Receivables coming into
existence on such Business Day, in cash, to the extent provided under the terms
of the Receivables Purchase Agreement, and to the extent any of such Purchase
Price remains unpaid, such remaining portion of such Purchase Price shall be
paid by means of (i) in the case of USS, as an Originator, an automatic
contribution to the capital (or in respect of membership interests) of the
Company as described in clause (A) of Section 3.2(ii), above and (ii) in the
                        ---------     ---------------
case of all other Originators, if any, an automatic increase to the outstanding
principal amount of the Company Note issued to such Originator.

     Servicer shall make all appropriate record keeping entries with respect to
the Company Notes or otherwise to reflect the foregoing payments and to reflect
adjustments pursuant to Section 3.4, and Servicer's books and records shall
                        -----------
constitute rebuttable presumptive evidence of the principal amount of and
accrued interest on any Company Note at any time. Furthermore,

                                       5
<PAGE>

Servicer shall hold the Company Notes for the benefit of the applicable
Originators, and all payments under the Company Notes shall be made to the
Servicer for the account of the applicable payee thereof. Each applicable
Originator hereby irrevocably authorizes Servicer to mark the Company Notes
"CANCELLED" and to return such Company Notes to the Company upon the final
payment thereof after the occurrence of the Purchase and Sale Termination Date.

     3.4. Settlement as to Specific Receivables and Dilution.
          --------------------------------------------------

     (a) If on the day of purchase or contribution of any Receivable from any
Originator hereunder, any of the representations or warranties set forth in
Section 5.3, 5.4 or 5.11 of such Originator is not true with respect to such
-----------  ---    ---
Receivable or as a result of any action or inaction of such Originator, on any
day any of such representations or warranties set forth in Section 5.3, 5.4 or
                                                           -----------  ---
5.11 is no longer true with respect to such a Receivable (other than a
----
representation or warranty set forth in Section 5.11(c) or (d) which is no
                                        --------------     ---
longer true as a result of an Obligor's payment obligation being discharged in
bankruptcy), then the Purchase Price (or in the case of a Contributed
Receivable, the Outstanding Balance of such Receivable (the "Contributed
                                                             -----------
Value")) with respect to such Receivables shall be reduced by an amount equal to
-----
the Outstanding Balance of such Receivable and shall be accounted to such
Originator as provided in subsection (c) below; provided, that if the Company
                          --------------        --------
thereafter receives payment on account of Collections due with respect to such
Receivable, the Company promptly shall deliver such funds to such Originator.

     (b) If, on any day, the Outstanding Balance of any Receivable (including
any Contributed Receivable) purchased (or contributed) hereunder is reduced or
adjusted as a result of any defective, rejected, returned goods or services, or
any discount or other adjustment made by any Originator, the Company or the
Servicer or any offset, setoff or dispute between such Originator or the
Servicer and an Obligor as indicated on the books of the Company (or, for
periods prior to the Closing Date, the books of such Originator), then the
Purchase Price or the Contributed Value, as the case may be, with respect to
such Receivable shall be reduced by the amount of such net reduction and shall
be accounted to Originator as provided in subsection (c) below.
                                          --------------

     (c) Any reduction in the Purchase Price (or Contributed Value) of any
Receivable pursuant to subsection (a) or (b) above shall be applied as a credit
                       --------------    --
for the account of the Company against the Purchase Price of Receivables
subsequently purchased by the Company from such Originator hereunder; provided,
                                                                      --------
however if there are no purchases of Receivables from such Originator (or
-------
insufficiently large purchases of Receivables) to create a Purchase Price
sufficient to so apply such credit against, the amount of such credit:

          (i) shall be paid in cash to the Company by such Originator in the
     manner and for application as described in the following proviso, or

                                       6
<PAGE>

          (ii) shall be deemed to be a payment under, and shall be deducted from
     the principal amount outstanding under, the Company Note, if applicable,
     payable to such Originator to the extent permitted under Section 1(m) of
     Exhibit IV of the Receivables Purchase Agreement;

provided, further, that at any time (x) when a Termination Event or Unmatured
--------  -------
Termination Event exists under the Receivables Purchase Agreement or (y) on or
after the Purchase and Sale Termination Date, the amount of any such credit
shall be paid by such Originator to the Company by deposit in immediately
available funds into the Collection Account for application to the same extent
as if Collections of the applicable Receivable in such amount had actually been
received on such date.

     (d) Each Purchase Report (other than the Purchase Report delivered on the
Closing Date) shall include, in respect of the Receivables previously generated
by each Originator (including the Contributed Receivables), a calculation of the
aggregate reductions described in subsection (a) or (b) relating to such
Receivables since the last Purchase Report delivered hereunder, as indicated on
the books of the Company (or, for such period prior to the Closing Date, the
books of the Originators).

     3.5. Reconveyance of Receivables. In the event that an Originator has paid
          ---------------------------
to the Company the full Outstanding Balance of any Receivable pursuant to
Section 3.4, the Company shall reconvey such Receivable to such Originator,
-----------
without representation or warranty, but free and clear of all liens created by
the Company.

                                   ARTICLE IV

                            CONDITIONS OF PURCHASES

     4.1. Conditions Precedent to Initial Purchase. The initial purchase
          ----------------------------------------
hereunder is subject to the condition precedent that the Company shall have
received, on or before the Closing Date, the following, each (unless otherwise
indicated) dated the Closing Date, and each in form, substance and date
satisfactory to the Company:

          (a) A copy of the resolutions of the Board of Directors of each
     Originator approving the Transaction Documents to be delivered by it and
     the transactions contemplated hereby and thereby, certified by the
     Secretary or Assistant Secretary of such Originator;

          (b) Good standing certificates for each Originator issued as of a
     recent date acceptable to Servicer by the Secretary of State of the
     jurisdiction of such Originator's incorporation and the jurisdiction where
     such Originator's chief executive office is located;

                                       7
<PAGE>

          (c) A certificate of the Secretary or Assistant Secretary of each
     Originator certifying the names and true signatures of the officers
     authorized on such Originator's behalf to sign the Transaction Documents to
     be delivered by it (on which certificate the Company and Servicer (if other
     than such Originator) may conclusively rely until such time as the Company
     and the Servicer shall receive from such Originator a revised certificate
     meeting the requirements of this subsection (c));
                                      ---------------

          (d) The articles of incorporation of each Originator, duly certified
     by the Secretary of State of the jurisdiction of such Originator's
     incorporation as of a recent date acceptable to Servicer, together with a
     copy of the by-laws of such Originator, each duly certified by the
     Secretary or an Assistant Secretary of such Originator;

          (e) Copies of the proper financing statements (Form UCC-1) that have
     been duly executed or authorized, as applicable, and name each Originator
     as the debtor/seller and the Company as the secured party/purchaser (and
     the Collateral Agent as assignee of the Company) of the Receivables
     generated by such Originator and Related Rights or other, similar
     instruments or documents, as may be necessary or, in Servicer's or any
     Funding Agent's opinion, desirable under the UCC of all appropriate
     jurisdictions or any comparable law of all appropriate jurisdictions to
     perfect the Company's ownership interest in all Receivables and Related
     Rights in which an ownership interest may be assigned to it hereunder;

          (f) A written search report from a Person satisfactory to Servicer and
     the Funding Agents listing all effective financing statements that name any
     Originator as debtor or assignor and that are filed in the jurisdictions in
     which filings were made pursuant to the foregoing subsection (e), together
                                                       --------------
     with copies of such financing statements (none of which, except for those
     described in the foregoing subsection (e), shall cover any Receivable or
                                --------------
     any Related Right), and tax and judgment lien search reports from a Person
     satisfactory to Servicer and the Funding Agents showing no evidence of any
     liens filed against any Originator with respect to the Receivables or
     Related Rights;

          (g) Favorable opinions of counsel to the Originators, in form and
     substance satisfactory to the Company and the Funding Agents;

          (h) Evidence (i) of the execution and delivery by each of the parties
     thereto of each of the other Transaction Documents to be executed and
     delivered in connection herewith and (ii) that each of the conditions
     precedent to the execution, delivery and effectiveness of such other
     Transaction Documents has been satisfied to the Company's satisfaction; and

          (i) A certificate from an officer of each Originator to the effect
     that Servicer and Originator have placed on the most recent, and have taken
     all steps reasonably

                                       8
<PAGE>

     necessary to ensure that there shall be placed on subsequent, summary
     master control data processing reports the following legend (or the
     substantive equivalent thereof): "THE RECEIVABLES DESCRIBED HEREIN HAVE
     BEEN SOLD TO U.S. STEEL RECEIVABLES LLC PURSUANT TO A PURCHASE AND SALE
     AGREEMENT, DATED AS OF NOVEMBER 28, 2001, AMONG UNITED STATES STEEL LLC,
     THE ORIGINATORS NAMED THEREIN AND U.S. STEEL RECEIVABLES LLC; AND AN
     INTEREST IN THE RECEIVABLES DESCRIBED HEREIN HAS BEEN GRANTED TO THE BANK
     OF NOVA SCOTIA, AS COLLATERAL AGENT, PURSUANT TO AN AMENDED AND RESTATED
     RECEIVABLES PURCHASE AGREEMENT, DATED AS OF NOVEMBER 28, 2001, AMONG UNITED
     STATES STEEL LLC, U.S. STEEL RECEIVABLES LLC, THE VARIOUS CP CONDUIT
     PURCHASERS, COMMITTED PURCHASERS AND FUNDING AGENTS FROM TIME TO TIME PARTY
     THERETO AND THE BANK OF NOVA SCOTIA, AS COLLATERAL AGENT."

     4.2. Certification as to Representations and Warranties. Each Originator,
          --------------------------------------------------
by accepting the Purchase Price related to the Receivables (and Related Rights)
generated by such Originator, shall be deemed to have certified that the
representations and warranties contained in Article V are true and correct on
                                            ---------
and as of such day, with the same effect as though made on and as of such day.

     4.3. Addition of Originators. Additional Persons may be added as
          -----------------------
Originators hereunder, with the consent of the Company and the Funding Agents;
provided that the following conditions are satisfied on or before the date of
such addition:

          (i) The Servicer shall have given each Funding Agent and the Company
     at least thirty (30) days prior written notice of such proposed addition
     and the identity of the proposed additional Originator and shall have
     provided such information with respect to the receivables of such
     additional Originator as any Funding Agent shall have reasonably requested;

          (ii) such proposed additional Originator has executed and delivered to
     the Company and the Funding Agents an agreement substantially in the form
     attached hereto as Exhibit C (each, a "Joinder Agreement");
                        ---------           -----------------

          (iii) such proposed additional Originator has delivered to the Company
     and the Funding Agents each of the documents with respect to such
     Originator described in Section 4.1;
                             -----------

          (iv) unless the receivables intended to be sold by such Originator to
     the Company hereunder are Receivables, the related underlying goods of
     which, are and will continue to be generated by an already existing
     Originator, the Funding Agents shall (if required by the documents
     governing the commercial paper program of the CP Conduit

                                       9
<PAGE>

     Purchasers related to any such Funding Agent) have received a written
     statement from each of Moody's and Standard & Poor's confirming that the
     addition of such Originator will not result in a downgrade or withdrawal of
     the current ratings of the Notes of such Funding Agent's related CP Conduit
     Purchaser(s); and

          (v) the Purchase and Sale Termination Date shall not have occurred.

                                   ARTICLE V

               REPRESENTATIONS AND WARRANTIES OF THE ORIGINATORS

     In order to induce the Company to enter into this Agreement and to make
purchases and accept contributions hereunder, each Originator, hereby makes with
respect to itself the representations and warranties set forth in this Article
                                                                       -------
V.
-

     5.1. Company Existence and Power. Such Originator is an entity duly
          ---------------------------
organized, validly existing and in good standing under the laws of the state of
its organization and has all necessary powers and all material governmental
licenses, authorizations, consents and approvals required to carry on its
business as currently conducted in each applicable jurisdiction.

     5.2. Company and Governmental Authorization: Contravention. The execution,
          -----------------------------------------------------
delivery and performance by such Originator of this Agreement and the other
Transaction Documents to which it is a party (i) are within the its
organizational powers, (ii) have been duly authorized by all necessary
organizational action, (iii) require no action or authorization by or in respect
of, or filing with, any governmental body, agency or official (other than the
UCC filings referred to in Section 4.1, all of which have been filed on or
                           -----------
before the first purchase or contribution hereunder) and (iv) do not contravene,
or constitute a default under, any provision of applicable law or regulation or
of its certificate of incorporation or by-laws (or applicable organizational
documents) or of any agreement, judgment, injunction, order, decree or other
instrument binding upon such Originator or result in the creation or imposition
of any Adverse Claim on any asset of such Originator or any of its Subsidiaries.
This Agreement and the other Transaction Documents to which it is a party have
been duly executed and delivered by such Originator.

     5.3. Enforceability. This Agreement and the other Transaction Documents to
          --------------
which it is a party are legal, valid and binding obligations of such Originator,
enforceable against such Originator in accordance with their respective terms,
except to the extent that enforceability may be limited by applicable
bankruptcy, insolvency, reorganization, moratorium or similar laws affecting
creditors' rights generally and to the extent that general equitable principles
may limit the right to obtain the remedy of specific performance of the
obligations hereunder and thereunder.

                                       10
<PAGE>

     5.4. Valid Sale or Contribution. Each sale or contribution, as the case may
          --------------------------
be, of Receivables and Related Rights made by such Originator pursuant to this
Agreement shall constitute a valid sale or contribution, as the case may be,
transfer, and assignment thereof to the Company, enforceable against creditors
of, and purchasers from, such Originator.

     5.5. Litigation. Except as set forth in either USX Corporation's or in such
          ----------
Originator's most recently distributed Form 10-K or 10-Q (or as otherwise
identified by such Originator to each Funding Agent and the Company in writing),
there is no action, suit, arbitration or other proceeding, inquiry or
investigation, at law or in equity, or before or by any court, public board or
body, arbitrator or arbitrate body pending against such Originator or of which
such Originator has otherwise received official notice or which to the knowledge
of such Originator is threatened against such Originator, wherein there is a
reasonable possibility of an unfavorable decision, ruling or finding that would
reasonably be expected to have a Material Adverse Effect, and since the dates of
the respective descriptions of proceedings contained in the reports identified
above, there has been no change in the status of such proceedings that would
reasonably be expected to have a Material Adverse Effect.

     5.6. Accuracy of Information. All reports (if prepared by such Originator
          -----------------------
or one of its Affiliates, or to the extent that information contained therein is
supplied by such Originators or an Affiliate), information, exhibit, financial
statement, document, book, record or report furnished or to be furnished at any
time by or on behalf of such Originator to the Company, any Funding Agent or any
Purchaser in connection with this Agreement or any other Transaction Document to
which it is a party is or will be complete and accurate in all material respects
as of its date or as of the date so furnished.

     5.7. Location. Such Originator's location (as such term is used in the
          --------
applicable UCC) and the office where it keeps its records concerning the
Receivables are located at the address set forth for such Originator below its
signature to this Agreement or in the Joinder Agreement pursuant to which it
became a party thereto.

     5.8. Bulk Sales Act. No transaction contemplated hereby requires compliance
          --------------
with any bulk sales act or similar law.

     5.9. Financial Condition.
          -------------------

     (a) On the date hereof, and on the date of each sale of Receivables by each
Originator to the Company (both before and after giving effect to such sale),
such Originator shall be Solvent.

     (b) The consolidated balance sheets of USS and its Subsidiaries as of
December 31, 2000 and the related statements of operations and cash flows for
the fiscal year then ended, copies of which have been furnished to the Company,
present fairly the consolidated financial position of USS and its Subsidiaries
at such date and the consolidated results of their operations

                                       11
<PAGE>

for the period ended on such date, all in accordance with generally accepted
accounting principles consistently applied; and since such date no event has
occurred that has had, or would have, a Material Adverse Effect.

     5.10. Margin Regulations. No use of any funds acquired by such Originator
           ------------------
under this Agreement will conflict with or contravene any of Regulations T, U
and X promulgated by the Board of Governors of the Federal Reserve System from
time to time.

     5.11. Quality of Title.
           ----------------

     (a) Each Receivable (together with the Related Rights) which is to be sold
or contributed to the Company hereunder is or shall be owned by such Originator,
free and clear of any Adverse Claim (other than any Adverse Claim arising solely
as a result of any action taken by the Company). Whenever the Company makes a
purchase, or accepts a contribution, hereunder, it shall have acquired a valid
and perfected ownership interest (free and clear of any Adverse Claim) in all
Receivables generated by such Originator and all Collections related thereto,
and in such Originator's entire right, title and interest in and to the other
Related Rights with respect thereto.

     (b) No effective financing statement or other instrument similar in effect
covering any Receivable generated by such Originator or any right related to any
such Receivable is on file in any recording office except such as may be filed
in favor of the Company or the Originators, as the case may be, in accordance
with this Agreement or in favor of the Collateral Agent in accordance with the
Receivables Purchase Agreement.

     (c) Each Receivable purchased or contributed hereunder and included, at any
time, in the calculation of the Net Receivables Pool Balance, was on the date of
such purchase or contribution, an Eligible Receivable.

     (d) Each Receivable purchased or contributed hereunder, and of an Obligor
that is not a resident of the United States, is not (and shall not at any time
be) subject to any currency controls imposed by any Governmental Authority under
the laws of which such Obligor is organized or a political subdivision thereof,
which currency controls restrict the ability of such Obligor to pay its
obligations in connection with such Pool Receivable.

     5.12. Trade Names. From and after the date that fell five (5) years before
           -----------
the date hereof, such Originator has not been known by any legal name other than
its company name as of the date hereof, nor has such Originator been the subject
of any merger or other reorganization except as disclosed on Schedule 5.12.
                                                             -------------

     5.13. Taxes. Such Originator has filed all material tax returns and reports
           -----
required by law to have been filed by it and has paid all taxes and governmental
charges thereby shown to be owing, except (i) any such taxes which are not yet
delinquent or are being diligently contested in

                                       12
<PAGE>

good faith by appropriate proceedings and for which adequate reserves in
accordance with GAAP shall have been set aside on its books and (ii) any such
taxes that are not reasonably likely to result in a Material Adverse Effect.

     5.14. Licenses and Labor Controversies.
           --------------------------------

     (a) Such Originator has not failed to obtain any licenses, permits,
franchises or other governmental authorizations necessary to the ownership of
its properties or to the conduct of its business, which violation or failure to
obtain could reasonably be expected to have a Material Adverse Effect; and

     (b) There are no labor controversies pending against such Originator that
have had or could reasonably be expected to have a Material Adverse Effect.

     5.15. Reliance on Separate Legal Identity. Such Originator is aware that
           -----------------------------------
Purchasers and the Funding Agents are entering into the Transaction Documents to
which they are parties in reliance upon the Company's identity as a legal entity
separate from any Originator.

     5.16. Purchase Price. The purchase price payable by the Company to such
           --------------
Originator hereunder is intended by such Originator and Company to be consistent
with the terms that would be obtained in an arm's length sale.

     5.17. Investment Company Act. Such Originator is not an "investment
           ----------------------
company" or a company "controlled" by an "investment company" within the meaning
of the Investment Company Act of 1940, as amended. In addition, such Originator
is not a "holding company," a "subsidiary company" of a "holding company" or an
"affiliate" of a "holding company" or of a "subsidiary company" of a "holding
company" within the meaning of the Public Utility Holding Company Act of 1935,
as amended.

                                   ARTICLE VI

                          COVENANTS OF THE ORIGINATORS

     6.1. Affirmative Covenants. From the date hereof until the first day
          ---------------------
following the Purchase and Sale Termination Date, each Originator will, unless
the Company and the Funding Agents shall otherwise consent in writing:

     (a) Compliance with Laws, Etc. Comply in all material respects with all
         -------------------------
applicable laws, rules, regulations and orders (including those with respect to
the Receivables generated by it and the related Contracts and other agreements),
and preserve and maintain its organizational existence, rights, franchises,
qualifications (including to remain qualified as a foreign organization in good
standing in each jurisdiction where the nature of its business so requires)

                                       13
<PAGE>

and privileges, except to the extent that the failure to do so would not be
reasonably expected to have a Material Adverse Effect.

     (b) Offices, Records and Books of Account, Etc. (i) Keep its location (as
         ------------------------------------------
such terms or similar terms are used in the UCC) and the office where it keeps
its records concerning the Receivables at the address of such Originator set
forth under its name on the signature page hereto (or in the Joinder Agreement
pursuant to which it became a party hereto) or, upon thirty days prior written
notice to the Company and the Funding Agents, at any other locations in
jurisdictions where all actions reasonably requested by the Company and the
Funding Agents to protect and perfect the interest of the Company and the
Collateral Agent in the Receivables and related items have been taken and
completed and (ii) shall provide the Company and the Funding Agents with at
least 30 days' written notice before making any change in its name or making any
other change in its identity or organizational status that could render any UCC
financing statement filed in connection with this Agreement (or other
Transaction Documents) "seriously misleading" as such term (or similar term) is
used in the UCC; each notice to the Company and the Funding Agents pursuant to
this sentence shall set forth the applicable change and the effective date
thereof. Such Originator will also maintain and implement administrative and
operating procedures (including an ability to recreate records evidencing
Receivables and related Contracts in the event of the destruction of the
originals thereof), and keep and maintain all documents, books, records,
computer tapes and disks and other information reasonably necessary or advisable
for the collection of all Receivables (including records adequate to permit the
daily identification of each Receivable and all Collections of and adjustments
to each existing Receivable).

     (c) Performance and Compliance with Contracts and Credit and Collection
         -------------------------------------------------------------------
Policy. At its expense, comply in all material respects with the applicable
------
Credit and Collection Policies with regard to each Receivable and the related
Contract, and timely and fully perform and comply with all provisions, covenants
and other promises required to be observed by it under the related Contracts and
all other agreements related to the Receivables and Related Rights.

     (d) Ownership Interest, Etc. At its expense, take all action necessary or
         -----------------------
desirable to establish and maintain a valid and enforceable ownership or
security interest, in the Receivables, the Related Rights and Collections with
respect thereto, free and clear of any Adverse Claim, in favor of the Company
and the Collateral Agent (for the benefit of the Purchasers), including taking
such action to perfect, protect or more fully evidence the interest of the
Company and the Collateral Agent (for the benefit of the Purchasers) as the
Company or any Funding Agent may reasonably request.

     (e) Audits. From time to time during regular business hours but no more
         ------
frequently than annually unless a Purchase and Sale Termination Event or
Unmatured Purchase and Sale Termination Event has occurred and is continuing, as
reasonably requested in advance (unless a Purchase and Sale Termination Event or
Unmatured Purchase and Sale Termination Event exists) by the Company or any
Funding Agent permit the Company or such Funding Agent, or its agents

                                       14
<PAGE>

or representatives: (i) to examine and make copies of and abstracts from all
books, records and documents (including computer tapes and disks) in the
possession or under the control of such Originator relating to Receivables and
the Related Rights, including the related Contracts, and (ii) to visit the
offices and properties of such Originator for the purpose of examining and
copying such materials described in clause (i) above, and to discuss matters
                                    ----------
relating to Receivables and the Related Rights or such Originator's or
performance under the Transaction Documents or under the Contracts with any of
the officers, employees, agents or contractors of such Originator having
knowledge of such matters.

     (f) Deposits to Lock-Box Accounts, the Concentration Account and the
         ----------------------------------------------------------------
Collection Account. Shall: (i) instruct all Obligors to make payments of all
------------------
Receivables to one or more Lock-Box Accounts or to post office boxes to which
only Lock-Box Banks have access (and shall instruct the Lock-Box Banks to cause
all items and amounts relating to such Receivables received in such post office
boxes to be removed and deposited into a Lock-Box Account on a daily basis), and
(ii) deposit, or cause to be deposited, any Collections received by it into the
Concentration Account not later than one Business Day after receipt thereof.
Each Lock-Box Account shall be subject to a Lock-Box Letter and each of the
Concentration Account and the Collection Account shall at all times be subject
to a Concentration Account Agreement and a Collection Account Agreement,
respectively. Such Originator will not deposit or otherwise credit, or cause or
permit to be so deposited or credited, to any Lock-Box Account, the
Concentration Account or the Collection Account cash or cash proceeds other than
Collections.

     (g) Separate Existence of the Company. Take such actions as shall be
         ---------------------------------
required in order that:

          (i) the Company's operating expenses (other than certain organization
     expenses and expenses incurred in connection with the preparation,
     negotiation and delivery of the Transaction Documents) will not be paid by
     such Originator;

          (ii) the Company's books and records will be maintained separately
     from those of such Originator;

          (iii) all financial statements of such Originator that are
     consolidated to include the Company will contain a disclosure describing
     this transaction and will indicate that (A) all of the Company's assets are
     owned by the Company, and (B) the Company is a separate entity with
     creditors who have received interests in the Company's assets;

          (iv) such Originator will, at all times, observe all formalities in
     its dealing with the Company;

          (v) except as otherwise provided in the Receivables Purchase Agreement
     in connection with the servicing of Receivables, such Originator shall not
     commingle its funds with any funds of the Company;

                                       15
<PAGE>

          (vi) such Originator will maintain arm's length relationships with the
     Company, and such Originator will be compensated at market rates for any
     services it renders or otherwise furnishes to the Company; and

          (vii) such Originator will not be, and will not hold itself out to be,
     responsible for the debts of the Company or the decisions or actions in
     respect of the daily business and affairs of the Company.

     6.2. Reporting Requirements. From the date hereof until the first day
          ----------------------
following the Purchase and Sale Termination Date, each Originator shall, unless
the Funding Agents and the Company shall otherwise consent in writing, furnish
to the Company and the Funding Agents:

          (a) Proceedings. Promptly after such Originator has knowledge thereof,
              -----------
     written notice to the Company and the Funding Agents of (i) all pending
     proceedings and investigations of the type described in Section 5.5 not
                                                             -----------
     previously disclosed to the Company and the Funding Agents and (ii) all
     material adverse developments that have occurred with respect to any
     previously disclosed proceedings and investigations.

          (b) Other. Promptly, from time to time, such other information,
              -----
     documents, records or reports respecting the Receivables, the Related
     Rights or such Originator's performance hereunder that the Company or any
     Funding Agent may from time to time reasonably request in order to protect
     the interests of the Company, the Purchasers, the Collateral Agent or any
     other Affected Person under or as contemplated by the Transaction
     Documents.

     6.3. Negative Covenants. From the date hereof until the first day following
          ------------------
the Purchase and Sale Termination Date, each Originator agrees that, unless the
Funding Agents and the Company shall otherwise consent in writing (which consent
shall not be unreasonably withheld), it shall not:

          (a) Sales, Liens, Etc. Sell, assign (by operation of law or otherwise)
              -----------------
     or otherwise dispose of, or create or suffer to exist any Adverse Claim
     upon or with respect to, any or all of its right, title or interest in, to
     or under any Receivable, Related Right or Collections, or upon or with
     respect to any account to which any Collections of any Receivables are
     sent, or assign any right to receive income in respect of any items
     contemplated by this paragraph.

          (b) Extension or Amendment of Receivables. Except as provided in the
              -------------------------------------
     Receivables Purchase Agreement, extend the maturity or adjust the
     Outstanding Balance or otherwise modify the terms of any Receivable, or
     amend, modify or waive any term or condition of any related Contract.

                                       16
<PAGE>

          (c) Change in Credit and Collection Policy. Make any material change
              --------------------------------------
     in the character of its business or in the Credit and Collection Policy, or
     any change in the Credit and Collection Policy that would materially and
     adversely affect the collectibility of the Receivables or the
     enforceability of any related Contract or the ability of such Originator to
     perform its obligations under any related Contract or under this Agreement.

          (d) Change in Lock-Box Banks, Lock-Box Accounts and Payment
              -------------------------------------------------------
     Instructions to Obligors. Add or terminate any bank as a Lock-Box Bank or
     ------------------------
     any account as a Lock- Box Account from those listed in Schedule II to the
     Receivables Purchase Agreement, or make any change in its instructions to
     Obligors regarding payments to be made to such Originator, the Company or
     any Lock-Box Account (or related post office box), unless the Funding
     Agents shall have consented thereto in writing and the Funding Agents shall
     have received copies of all agreements and documents (including Lock-Box
     Letters) that they may request in connection therewith.

          (e) Receivables Not to be Evidenced by Promissory Notes or Chattel
          ------------------------------------------------------------------
     Paper. Take any action to cause or permit any Receivable generated by it to
     -----
     become evidenced by any "instrument" or "chattel paper" (as defined in the
     applicable UCC) unless such "instrument" or "chattel paper" shall be
     delivered to the Company (which in turn shall deliver the same to the
     Collateral Agent for the benefit of the Purchasers).

          (f) Mergers, Acquisitions, Sales, etc. (i) Be a party to any merger or
              ---------------------------------
     consolidation, except (A) a merger or consolidation where such Originator
     is the surviving corporation or (B) any other merger or consolidation
     consented to in writing by each Funding Agent (which consent, solely in the
     case of a merger or consolidation of such Originator into an Affiliate of
     USS, shall not be unreasonably withheld), prior to the occurrence thereof
     and pursuant to which all actions requested by any Funding Agent to protect
     or perfect the interests of the Company and/or the Collateral Agent in the
     Receivables and Related Rights have been taken or otherwise performed to
     the satisfaction of each such Funding Agent (including the receipt by such
     Funding Agents of an opinion of counsel as to any UCC or other company
     matters relating to such merger or consolidation as either Funding Agent
     may request) or (ii) directly or indirectly sell, transfer, assign, convey
     or lease (A) whether in one or a series of transactions, all or
     substantially all of its assets or (B) any Receivables or any interest
     therein (other than pursuant to this Agreement).

          (g) Accounting for Purchases. Account for or treat (whether in
              ------------------------
     financial statements or otherwise) the transactions contemplated hereby in
     any manner other than as sales of the Receivables and Related Security by
     such Originator to the Company.

          (h) Transaction Documents. Enter into, execute, deliver or otherwise
              ---------------------
     become bound by any agreement, instrument, document or other arrangement
     that restricts the right of such Originator to amend, supplement, amend and
     restate or otherwise modify, or

                                       17
<PAGE>

     to extend or renew, or to waive any right under, this Agreement or any
     other Transaction Documents.

                                  ARTICLE VII

                      ADDITIONAL RIGHTS AND OBLIGATIONS IN
                           RESPECT OF THE RECEIVABLES

     7.1. Rights of the Company. Each Originator hereby authorizes the Company
          ---------------------
and the Servicer or their respective designees to take any and all steps in such
Originator's name necessary or desirable, in their respective determination,
after the occurrence and during the continuation of a Purchase and Sale
Termination Event, to collect all amounts due under any and all Receivables and
Related Rights, including, without limitation, endorsing such Originator's name
on checks and other instruments representing Collections and enforcing such
Receivables and the provisions of the related Contracts that concern payment
and/or enforcement of rights to payment.

     7.2. Responsibilities of Each Originator. Anything herein to the contrary
          -----------------------------------
notwithstanding:

          (a) Each Originator agrees to (A) direct, and hereby grants to each of
     the Company and the Collateral Agent (with the consent or at the direction
     of the Funding Agents) the authority to, after the occurrence and during
     the continuation of a Purchase and Sale Termination Event, direct, all
     Obligors of Receivables originated by such Originator to make payments of
     such Receivables directly to a Lock-Box Account at a Lock-Box Bank, and (B)
     to transfer any Collections that it receives directly, to Servicer (for
     deposit to such a Lock-Box Account) within one Business Day of receipt
     thereof, and agrees that all such Collections shall be deemed to be
     received in trust for the Company.

          (b) Each Originator shall perform its obligations hereunder, and the
     exercise by the Company or its designee of its rights hereunder shall not
     relieve such Originator from such obligations.

          (c) None of the Company, Servicer, the Purchasers, the Funding Agents
     or the Collateral Agent shall have any obligation or liability to any
     Obligor or any other third Person with respect to any Receivables,
     Contracts related thereto or any other related agreements, nor shall the
     Company, Servicer, the Purchasers, the Funding Agents or the Collateral
     Agent be obligated to perform any of the obligations of any Originator
     thereunder.

          (d) Each Originator hereby grants to Collateral Agent (for the benefit
     of the Purchasers) an irrevocable power of attorney, with full power of
     substitution, coupled

                                       18
<PAGE>

     with an interest, to take in the name of such Originator all steps
     necessary or advisable, after the occurrence and during the continuation of
     a Purchase and Sale Termination Event, to indorse, negotiate or otherwise
     realize on any writing or other right of any kind held or transmitted by
     such Originator or transmitted or received by the Company (whether or not
     from such Originator) in connection with any Receivable or Related Right.

     7.3. Further Action Evidencing Purchases. Each Originator agrees that from
          -----------------------------------
time to time, at its expense, it will promptly execute and deliver all further
instruments and documents, and take all further action that the Company,
Servicer or any Funding Agent may reasonably request in order to perfect,
protect or more fully evidence the Receivables (and the Related Rights)
purchased by, or contributed to, the Company hereunder, or to enable the Company
to exercise or enforce any of its rights hereunder or under any other
Transaction Document. Without limiting the generality of the foregoing, upon the
request of the Company or any Funding Agent, each Originator will:

          (a) execute and file such financing or continuation statements, or
     amendments thereto or assignments thereof, and such other instruments or
     notices, as may be necessary or appropriate; and

          (b) mark the summary master control data processing records with the
     legend set forth in Section 4.1(i).
                         --------------

Each Originator hereby authorizes the Company or its designee to file one or
more financing or continuation statements, and amendments thereto and
assignments thereof, relative to all or any of the Receivables (and the Related
Rights) now existing or hereafter generated by such Originator. If any
Originator fails to perform any of its agreements or obligations under this
Agreement, the Company or its designee may (but shall not be required to) itself
perform, or cause performance of, such agreement or obligation, and the expenses
of the Company or its designee incurred in connection therewith shall be payable
by such non-performing Originator as provided in Section 9.1.
                                                 -----------
     7.4. Application of Collections. Any payment by an Obligor in respect of
          --------------------------
any indebtedness owed by it to any Originator shall, except as otherwise
specified by such Obligor or otherwise required by contract or law and unless
otherwise instructed by the Company or the Funding Agents, be applied first, as
                                                                      -----
a Collection of any Receivables of such Obligor, in the order of the age of such
Receivables, starting with the oldest of such Receivables, and second, to any
                                                               ------
other indebtedness of such Obligor.

                                  ARTICLE VIII

                      PURCHASE AND SALE TERMINATION EVENTS

                                       19
<PAGE>

     8.1. Purchase and Sale Termination Events. Each of the following events or
          ------------------------------------
occurrences described in this Section 8.1 shall constitute a "Purchase and Sale
                              -----------                     -----------------
Termination Event":
-----------------

          (a) The Facility Termination Date (as defined in the Receivables
     Purchase Agreement) shall have occurred; or

          (b) Any Originator shall fail to make any payment or deposit to be
     made by it hereunder when due; or

          (c) Any representation or warranty made or deemed to be made by any
     Originator (or any of its officers) under or in connection with this
     Agreement, any other Transaction Document or any other information or
     report delivered pursuant hereto or thereto shall prove to have been false
     or incorrect in any material respect when made or deemed made; or

          (d) Any Originator shall fail to perform or observe in any material
     respect any agreement contained in any of Sections 6.1(g) or 6.3; or
                                               ---------------    ---

          (e) Except as otherwise specifically provided in this Section 8.1, any
                                                                -----------
     Originator shall fail to perform or observe any other term, covenant or
     agreement contained in this Agreement on its part to be performed or
     observed and such failure shall continue unremedied for a period of 30
     days; or

          (f) (i) Any Originator shall admit in writing its inability to pay its
     debts generally, or shall make a general assignment for the benefit of
     creditors; or any proceeding shall be instituted by or against such
     Originator seeking to adjudicate it as bankrupt or insolvent, or seeking
     liquidation, winding up, reorganization, arrangement, adjustment,
     protection, relief, or composition of it or its debts under any law
     relating to bankruptcy, insolvency or reorganization or relief of debtors,
     or seeking the entry of an order for relief or the appointment of a
     receiver, trustee, or other similar official for it or for all or any
     substantial part of its property and, in the case of any such proceeding
     instituted against it (but not instituted by it), such proceeding shall
     remain undismissed or unstayed for a period of 60 days; or (ii) any
     Originator shall take any action to authorize any of the actions set forth
     in clause (i) above in this Section 8.1(f); or
        ----------               --------------

          (g) A contribution failure shall occur with respect to any benefit
     plan sufficient to give rise to a lien under Section 302(f) of ERISA, or
     the Internal Revenue Service shall, or shall indicate its intention in
     writing to any Originator to, file notice of a lien asserting a claim or
     claims pursuant to the Code with regard to any of the assets of such
     Originator, or the Pension Benefit Guaranty Corporation shall, or shall
     indicate its intention in writing to such Originator or an ERISA Affiliate
     to, either file notice of a lien

                                       20
<PAGE>

     asserting a claim pursuant to ERISA with regard to any assets of such
     Originator or an ERISA Affiliate or terminate any benefit plan that has
     unfunded benefit liabilities.

     8.2. Remedies.
          --------

     (a) Optional Termination. Upon the occurrence of a Purchase and Sale
         --------------------
Termination Event, the Company shall have the option by written notice to the
Originators (with a copy to each Funding Agent) to declare the Purchase and Sale
Termination Date to have occurred.

     (b) Remedies Cumulative. Upon any termination of the Purchase Facility
         -------------------
pursuant to this Section 8.2, the Company shall have, in addition to all other
                 -----------
rights and remedies under this Agreement or otherwise, all other rights and
remedies provided under the UCC of each applicable jurisdiction and other
applicable laws, which rights shall be cumulative.

                                   ARTICLE IX

                                INDEMNIFICATION

     9.1. Indemnities by the Originators. Without limiting any other rights
          ------------------------------
which the Company may have hereunder or under applicable law, each Originator,
severally and for itself alone, and USS, jointly and severally with each
Originator, hereby agrees to indemnify the Company and each of its assigns,
officers, directors, employees and agents (each of the foregoing Persons being
individually called a "Purchase and Sale Indemnified Party"), forthwith on
                       -----------------------------------
demand, from and against any and all damages, losses, claims, judgments,
liabilities and related costs and expenses, including reasonable attorneys' fees
and disbursements (all of the foregoing being collectively called "Purchase and
                                                                   ------------
Sale Indemnified Amounts") awarded against or incurred by any of them arising
------------------------
out of or as a result of the following:

          (a) the transfer by such Originator of an interest in any Receivable
     or Related Right to any Person other than the Company;

          (b) the breach of any representation or warranty made or deemed made
     by such Originator under this Agreement or any other Transaction Document,
     or any information or report delivered by such Originator pursuant hereto
     or thereto which shall have been false or incorrect in any respect when
     made or deemed made;

          (c) the failure by such Originator to comply with any applicable law,
     rule or regulation with respect to any Receivable or the related Contract,
     or the nonconformity of any Receivable or the related Contract with any
     such applicable law, rule or regulation;

          (d) the failure to vest in the Company an ownership interest in the
     Receivables generated by such Originator and the Related Rights free and
     clear of any Adverse Claim;

                                       21
<PAGE>

          (e) the failure of such Originator to file with respect to itself, or
     any delay by such Originator in filing, financing statements or other
     similar instruments or documents under the UCC of any applicable
     jurisdiction or other applicable laws with respect to any Receivables or
     purported Receivables generated by such Originator or any Related Rights,
     whether at the time of any purchase or contribution or at any subsequent
     time;

          (f) any dispute, claim, offset or defense (other than discharge in
     bankruptcy) of the Obligor to the payment of any Receivable or purported
     Receivable generated by such Originator (including, without limitation, a
     defense based on such Receivable or the related Contract not being a legal,
     valid and binding obligation of such Obligor enforceable against it in
     accordance with its terms), or any other claim resulting from the goods or
     services related to any such Receivable or the furnishing of or failure to
     furnish such goods or services;

          (g) any litigation, proceeding or investigation against such
     Originator;

          (h) any tax or governmental fee or charge (other than any tax excluded
     pursuant to the proviso below), all interest and penalties thereon or with
     respect thereto, and all out-of-pocket costs and expenses, including the
     reasonable fees and expenses of counsel in defending against the same,
     which may arise by reason of the purchase, contribution or ownership of the
     Receivables or any Related Right connected with any such Receivables;

          (i) any failure of such Originator to perform its duties or
     obligations in accordance with the provisions of this Agreement or any
     other Transaction Document; and

          (j) the commingling of Collections on Receivables of such Originator,
     at any time with other funds;

excluding, however, (i) Purchase and Sale Indemnified Amounts to the extent
---------  -------
resulting from gross negligence or willful misconduct on the part of such
Purchase and Sale Indemnified Party, (ii) any indemnification which has the
effect of recourse for non-payment of the Receivables due to credit reasons of
the related Obligor to any indemnitor and (iii) any overall net income taxes or
franchise taxes imposed on such Purchase and Sale Indemnified Party by the
jurisdiction under the laws of which such Purchase and Sale Indemnified Party is
organized or any political subdivision thereof.

     If for any reason the indemnification provided above in this Section 9.1 is
                                                                  -----------
unavailable to a Purchase and Sale Indemnified Party or is insufficient to hold
such Purchase and Sale Indemnified Party harmless, then each of the Originators,
severally and for itself alone, and USS, jointly and severally with each
Originator, shall contribute to the amount paid or payable by such

                                       22
<PAGE>

Purchase and Sale Indemnified Party as a result of such loss, claim, damage or
liability to the maximum extent permitted under applicable law.

                                   ARTICLE X

                                 MISCELLANEOUS

     10.1. Amendments, etc.
           ---------------

     (a) The provisions of this Agreement may from time to time be amended,
modified or waived, if such amendment, modification or waiver is in writing and
consented to by the Company, the Funding Agents and the Originators (with
respect to an amendment) or by the Company (with respect to a waiver or consent
by it); provided, however, that no such material amendment shall be effective
        --------  -------
unless the Rating Agency Condition shall have been satisfied with respect
thereto.

     (b) No failure or delay on the part of the Company, Servicer, any
Originator or any third party beneficiary in exercising any power or right
hereunder shall operate as a waiver thereof, nor shall any single or partial
exercise of any such power or right preclude any other or further exercise
thereof or the exercise of any other power or right. No notice to or demand on
the Company, Servicer, or any Originator in any case shall entitle it to any
notice or demand in similar or other circumstances. No waiver or approval by the
Company or Servicer under this Agreement shall, except as may otherwise be
stated in such waiver or approval, be applicable to subsequent transactions. No
waiver or approval under this Agreement shall require any similar or dissimilar
waiver or approval thereafter to be granted hereunder.

     10.2. Notices, etc. All notices and other communications provided for
           ------------
hereunder shall, unless otherwise stated herein, be in writing (including
facsimile communication) and shall be personally delivered or sent by express
mail or courier or by certified mail, postage-prepaid, or by facsimile, to the
intended party at the address or facsimile number of such party set forth under
its name on the signature pages hereof or at such other address or facsimile
number as shall be designated by such party in a written notice to the other
parties hereto. All such notices and communications shall be effective, (i) if
personally delivered or sent by express mail or courier or if sent by certified
mail, when received, and (ii) if transmitted by facsimile, when sent, receipt
confirmed by telephone.

     10.3. No Waiver; Cumulative Remedies. The remedies herein provided are
           ------------------------------
cumulative and not exclusive of any remedies provided by law.

     10.4. Binding Effect; Assignability. This Agreement shall be binding upon
           -----------------------------
and inure to the benefit of the Company and each Originator and their respective
successors and permitted assigns; provided, however, that no Originator may
                                  --------  -------
assign its rights hereunder or any interest

                                       23
<PAGE>

herein or delegate its duties hereunder without the prior consent of the Company
and the Funding Agents. This Agreement shall create and constitute the
continuing obligations of the parties hereto in accordance with its terms, and
shall remain in full force and effect until the date after the Purchase and Sale
Termination Date on which the Originators have received payment in full for all
Receivables and Related Rights purchased pursuant to Section 1.1 hereof. The
                                                     -----------
rights and remedies with respect to any breach of any representation and
warranty made by any Originator pursuant to Article V and the indemnification
                                            ---------
and payment provisions of Article IX and Section 10.6 shall be continuing and
                          ----------     ------------
shall survive any termination of this Agreement.

     10.5. Governing Law. THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN
           -------------
ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

     10.6. Costs, Expenses and Taxes. In addition to the obligations of the
           -------------------------
Originators under Article IX, each Originator agrees to pay on demand:
                  ----------

          (a) all reasonable costs and expenses in connection with the
     enforcement of this Agreement and the other Transaction Documents; and

          (b) all stamp and other similar taxes and fees payable or determined
     to be payable in connection with the execution, delivery, filing and
     recording of this Agreement or the other Transaction Documents, and agrees
     to indemnify each Purchase and Sale Indemnified Party against any
     liabilities with respect to or resulting from any delay in paying or
     omission to pay such taxes and fees.

     10.7. Submission to Jurisdiction. EACH PARTY HERETO HEREBY IRREVOCABLY (a)
           --------------------------
SUBMITS TO THE NON-EXCLUSIVE JURISDICTION OF ANY COURT OF THE STATE OF NEW YORK
OR OF THE UNITED STATES FOR THE SOUTHERN DISTRICT OF NEW YORK, OVER ANY ACTION
OR PROCEEDING ARISING OUT OF OR RELATING TO ANY TRANSACTION DOCUMENT; (b) AGREES
THAT ALL CLAIMS IN RESPECT OF SUCH ACTION OR PROCEEDING MAY BE HEARD AND
DETERMINED IN SUCH STATE OR UNITED STATES FEDERAL COURT; (c) WAIVES, TO THE
FULLEST EXTENT IT MAY EFFECTIVELY DO SO UNDER APPLICABLE LAW, THE DEFENSE OF AN
INCONVENIENT FORUM TO THE MAINTENANCE OF SUCH ACTION OR PROCEEDING; (d) CONSENTS
TO THE SERVICE OF ANY AND ALL PROCESS IN ANY SUCH ACTION OR PROCEEDING BY THE
MAILING OF COPIES OF SUCH PROCESS TO SUCH PERSON AT ITS ADDRESS SPECIFIED IN
SECTION 10.2; AND (e) TO THE EXTENT ALLOWED BY LAW, AGREES THAT A NONAPPEALABLE
------------
FINAL JUDGMENT IN ANY SUCH ACTION OR PROCEEDING SHALL BE CONCLUSIVE AND MAY BE
ENFORCED IN OTHER JURISDICTIONS BY SUIT ON THE JUDGMENT OR IN ANY OTHER MANNER
PROVIDED BY LAW. NOTHING IN THIS SECTION 10.7 SHALL AFFECT THE COMPANY'S RIGHT
                                 ------------
TO SERVE LEGAL PROCESS IN ANY OTHER MANNER PERMITTED BY LAW OR TO BRING ANY
ACTION OR PROCEEDING

                                       24
<PAGE>

AGAINST ANY ORIGINATOR OR ITS RESPECTIVE PROPERTY IN THE COURTS OF ANY OTHER
JURISDICTIONS.

     10.8. Waiver of Jury Trial. EACH PARTY HERETO EXPRESSLY WAIVES ANY RIGHT TO
           --------------------
A TRIAL BY JURY IN ANY ACTION OR PROCEEDING TO ENFORCE OR DEFEND ANY RIGHTS
UNDER THIS AGREEMENT, ANY OTHER TRANSACTION DOCUMENT, OR UNDER ANY AMENDMENT,
INSTRUMENT OR DOCUMENT DELIVERED OR WHICH MAY IN THE FUTURE BE DELIVERED IN
CONNECTION HEREWITH OR ARISING FROM ANY RELATIONSHIP EXISTING IN CONNECTION WITH
THIS AGREEMENT OR ANY OTHER TRANSACTION DOCUMENT, AND AGREES THAT ANY SUCH
ACTION OR PROCEEDING SHALL BE TRIED BEFORE A COURT AND NOT BEFORE A JURY.

     10.9. Captions and Cross References; Incorporation by Reference. The
           ---------------------------------------------------------
various captions (including, without limitation, the table of contents) in this
Agreement are included for convenience only and shall not affect the meaning or
interpretation of any provision of this Agreement. References in this Agreement
to any underscored Section or Exhibit are to such Section or Exhibit of this
Agreement, as the case may be. The Exhibits hereto are hereby incorporated by
reference into and made a part of this Agreement.

     10.10. Execution in Counterparts. This Agreement may be executed in any
            -------------------------
number of counterparts and by different parties hereto in separate counterparts,
each of which when so executed shall be deemed to be an original and all of
which when taken together shall constitute one and the same Agreement.

     10.11. Acknowledgment and Agreement. By execution below, each Originator
            ----------------------------
expressly acknowledges and agrees that all of the Company's rights, title, and
interests in, to, and under this Agreement shall be assigned by the Company to
the Collateral Agent (for the benefit of the Purchasers) pursuant to the
Receivables Purchase Agreement, and such Originator consents to such assignment.
Each of the parties hereto acknowledges and agrees and hereby intends that the
Collateral Agent, the Funding Agents and the Purchasers are third party
beneficiaries of the rights of the Company arising hereunder and under the other
Transaction Documents to which such Originator is a party.

                           (SIGNATURE PAGE TO FOLLOW)

                                       25
<PAGE>

     IN WITNESS WHEREOF, the parties have caused this Agreement to be executed
by their respective officers thereunto duly authorized, as of the date first
above written.

                                    U.S. STEEL RECEIVABLES LLC

                                    By: /s/ L.T. Brockway
                                        ----------------------------------------
                                    Name: L.T. Brockway
                                    Title: Vice President

                                    Address:    600 Grant Street
                                                Pittsburgh, PA 15219
                                                Attention: Assistant Treausurer-
                                                Cash & Banking
                                                Telephone: (412) 433-4759
                                                Facsimile: (412) 433-4567

                                    UNITED STATES STEEL LLC,
                                      as initial Servicer

                                    By: /s/ D.C. Greiner
                                        ----------------------------------------
                                    Name: D.C. Greiner
                                    Title: Assistant Treasurer

                                    Address:    600 Grant Street
                                                Pittsburgh, PA 15219
                                                Attention: Assistant Treausurer-
                                                Cash & Banking
                                                Telephone: (412) 433-4759
                                                Facsimile: (412) 433-4567

                                    UNITED STATES STEEL LLC,
                                      as initial Servicer

                                    By: /s/ G.R. Haggerty
                                        ----------------------------------------
                                    Name: G.R. Haggerty
                                    Title: Vice President
                                           Accounting & Finance

                                      S-1
<PAGE>

                                    THE ORIGINATORS:

                                    UNITED STATES STEEL LLC,
                                      as an Originator

                                    By: /s/ D.C. Greiner
                                        ----------------------------------------
                                    Name: D.C. Greiner
                                    Title: Assistant Treasurer

                                    Address:    600 Grant Street
                                                Pittsburgh, PA 15219
                                                Attention: Assistant Treausurer-
                                                Cash & Banking
                                                Telephone: (412) 433-4759
                                                Facsimile: (412) 433-4567

                                    UNITED STATES STEEL LLC,
                                      as an Originator

                                    By: /s/ G.R. Haggerty
                                        ----------------------------------------
                                    Name: G.R. Haggerty
                                    Title: Vice President
                                           Accounting & Finance

                                      S-2
<PAGE>

                                 SCHEDULE 5.12

                                  TRADE NAMES
<PAGE>

                                   EXHIBIT A

                            FORM OF PURCHASE REPORT
<PAGE>

                                   EXHIBIT B

                              FORM OF COMPANY NOTE
<PAGE>

                                   EXHIBIT C

                           FORM OF JOINDER AGREEMENT<PAGE>

                                                                   Exhibit 10.39

                         SECOND AMENDMENT TO AMENDED AND
                  RESTATED CREDIT AGREEMENT AND LIMITED WAIVER

         This Second Amendment to Amended and Restated Credit Agreement and
Limited Waiver (the "Amendment") is entered into as of December 31, 2001.

                                    RECITALS
                                    --------

         This Amendment is entered into in reference to the following facts:

                (a) WHEREAS, the Amended and Restated Credit Agreement is dated
as of February 9, 2001 and made between Wireless Facilities, Inc., as Borrower,
the financial institutions from time to time party thereto as Banks, Credit
Suisse First Boston as Sole Lead Arranger, Administrative Agent and Collateral
Agent, Bank One Arizona, N.A. as Syndication Agent, and Bank of America N.A., as
Documentation Agent as amended by the First Amendment to Amended and Restated
Credit Agreement dated as of July 19, 2001 (as the same may be amended,
restated, supplemented and otherwise modified, the "Credit Agreement").
Capitalized terms used herein, without definition shall have the meaning
assigned thereto in the Credit Agreement.

                (b) WHEREAS, the Borrower, the Agents and the Banks executing
this Amendment desire to amend the Credit Agreement in certain respects, subject
to the terms hereof.

         NOW THEREFORE, in consideration of the mutual covenants contained
         -------------
herein, the parties hereto hereby agree as follows:

                             ARTICLE I - AMENDMENTS
                             ----------------------

         1.1    Amendment of Section 1.1
                ------------------------

         Section 1.1 of the Credit Agreement shall be amended:

                (a) by deleting the definition of "Applicable Base Rate Margin"
and "Applicable LIBOR Margin" set forth therein in their entirety and
substituting the following therefor (both in subsection 1.1 and as used in the
other provisions of the Credit Agreement and the other Credit Documents):

         "Applicable Base Rate Margin" a percentage per annum determined by
reference to the Senior Leverage Ratio as set forth below:

<PAGE>

                        ----------------------------------------------
                                    Senior             Applicable
                                Leverage Ratio         Base Rate
                                                        Margin
                        ----------------------------------------------
                        *3.00 : 100                      2.50%
                        ----------------------------------------------
                        *2.50 : 1.00 and **              2.00%
                        3.00 : 1.00
                        ----------------------------------------------
                        *1.75 : 1.00 and **              1.50%
                        2.50 : 1.00
                        ----------------------------------------------
                        *1.50 : 1.00 and **              1.25%
                        1.75 : 1.00
                        ----------------------------------------------
                        * 1.25 : 1.00 and **             1.00%
                        1.50 : 1.00
                        ----------------------------------------------
                        ** 1.25 : 1.00                   0.75%
                        ----------------------------------------------

* greater than
** less than/equal to

         The Applicable Base Rate Margin shall be determined by reference to the
Senior Leverage Ratio as of the end of the most recently ended Fiscal Quarter
for which the financial statements required by Section 6.1(a) have been
delivered in accordance therewith; provided, however, that (x) no change in the
Applicable Base Rate Margin shall be effective until the date on which the
Administrative Agent and each Bank receives such financial statements and a
Compliance Certificate calculating such Senior Leverage Ratio in reasonable
detail, and (y) the Applicable Base Rate Margin shall be 2.50% per annum for so
long (but only for so long) as the Borrower has not submitted to the
Administrative Agent and each Bank the information described in clause (x) of
this proviso as and when required under Section 6.1(a); provided further, that
for the purpose of calculating Applicable Base Rate Margin, EBITDA shall be
calculated in accordance with the definition of such term as in effect
immediately prior to the Second Amendment Effective Date.

                  "Applicable LIBOR Margin" means a percentage per annum
determined by reference to the Senior Leverage Ratio as set forth below:

                     ---------------------------------------------
                                Senior            Applicable
                            Leverage Ratio          LIBOR
                                                    Margin
                     ---------------------------------------------
                     *3.00 : 100                     3.50%
                     ---------------------------------------------
                     *2.50 : 1.00 and **             3.00%
                     3.00 : 1.00
                     ---------------------------------------------
                     *1.75 : 1.00 and **             2.50%
                     2.50 : 1.00

* greater than
** less than/equal to

                                        2

<PAGE>

               --------------------------------------------
               * 1.50 : 1.00 and **           2.25%
               1.75 : 1.00
               --------------------------------------------
               * 1.25 : 1.00 and **           2.00%
               1.50 : 1.00
               --------------------------------------------
               ** 1.25 : 1.00                 1.75%
               --------------------------------------------

* greater than
** less than/equal to

         The Applicable LIBOR Margin shall be determined by reference to the
Senior Leverage Ratio as of the end of the most recently ended Fiscal Quarter
for which the financial statements required by Section 6.1(a) have been
delivered in accordance therewith; provided, however, that (x) no change in the
Applicable LIBOR Margin shall be effective until the date on which the
Administrative Agent and each Bank receives such financial statements and a
Compliance Certificate calculating such Senior Leverage Ratio in reasonable
detail, and (y) the Applicable LIBOR Margin shall be 3.50% per annum for so long
(but only for so long) as the Borrower has not submitted to the Administrative
Agent and each Bank the information described in clause (x) of this proviso as
and when required under Section 6.1(a); provided further, that for the purpose
of calculating Applicable LIBOR Margin, EBITDA shall be calculated in accordance
with the definition of such term as in effect immediately prior to the Second
Amendment Effective Date.

               (b)  by adding in alphabetical order the following new
definitions as follows:

               "Second Amendment" means the Second Amendment, dated as of
December 31, 2001 to the Credit Agreement, by and among Company, the Banks party
thereto, Administrative Agent, Managing Agent, Documentation Agent and
Syndication Agent.

               "Second Amendment Effective Date" means the date upon which the
conditions to effectiveness in Article IV of the Second Amendment are satisfied
                               ----------
or waived.

               (c)  by deleting paragraph (x) of the definition of "Permitted
Investments" and substituting the following therefor:

         "(x) intercompany payables which: (a) are owed by any Subsidiary which
is not a Guarantor to the Borrower or a Subsidiary which is a Guarantor; (b)
remain on intercompany account for periods not in excess of 250 days from the
date of such payment by Borrower or a Subsidiary which is a Guarantor, as
applicable, (c) shall not exceed an aggregate $50,000,000 outstanding at any
time; provided, however, such intercompany payables shall not exceed $15,000,000
      --------  -------
in the aggregate in any individual country in which Borrower conducts business,
excluding Mexico for which such intercompany payables shall not exceed
$40,000,000 in the aggregate and (d) comply with the requirements of Section
7.4, including, without limitation, (i) the subordination of such intercompany
payables in right of payment to the payment in full of the Obligations pursuant
to the terms of the applicable promissory note or an intercompany subordination
agreement, that in any such case, is reasonably satisfactory to the
Administrative Agent and (ii) evidencing such intercompany payables by a
promissory note which is subject to a First Priority Lien in favor of the
Collateral Agent pursuant to a Collateral Document."

                                        3

<PAGE>

          1.2  Limitation on Commitments. Schedule 1 of the Credit Agreement
               -------------------------
shall be amended by deleting it in its entirety and replacing it with Schedule 1
annexed hereto as Annex A.

          1.3  Amendment of Section 2.1. Limitation of Revolving Credit
               --------------------------------------------------------
Advances.
--------

          Subsection 2.1(b) shall be amended by adding the following proviso at
the end thereof:

     "Provided, however that notwithstanding anything to the contrary set forth
      --------  -------
herein in no event shall Banks make further revolving credit advances to the
Borrower in the aggregate in excess of $10,000,000 in the first Fiscal Quarter
of 2002."

          1.4  Amendment of Section 6.1: Information Covenants.
               -----------------------------------------------

          Section 6.1(g) shall be amended by deleting it in its entirety and
substituting the following therefor:

     "(g) Quarterly Intercompany Loan Balances. Within 45 Business days after
          ------------------------------------
the close of each quarter in each Fiscal Year of the Borrower, the balance of
all intercompany loans permitted under Section 7.4."

          1.5  Amendment of Section 7.3: Dividends.
               -----------------------------------

          Section 7.3 shall be amended by adding the following proviso at the
end of the last sentence thereto:

     "provided, however, such repurchase of Capital Stock from directors and
      --------  -------
officers shall not exceed $5,000,000 in aggregate during the term of this
Agreement."

          1.6  Amendment of Section 7.4: Indebtedness. Section 7.4 shall be
               --------------------------------------
amended by deleting it in its entirety and substituting the following therefor:

     "7.4 Indebtedness. The Borrower will not, and shall not permit any of its
          ------------
Subsidiaries to, directly or indirectly contract, create, incur, guarantee,
assume or suffer to exist any Indebtedness, except (a) Indebtedness of the
Borrower or its Subsidiaries incurred under the Transaction Documents, (b)
Schedule Indebtedness, (c) so long as no Default has occurred and is continuing
at the time such Indebtedness is incurred or would result from the making
thereof, Purchase Money Indebtedness, (d) accrued expenses and current trade
accounts payable incurred in the ordinary course of business, and obligations
under trade letters of credit in the ordinary course of business, which are to
be repaid in full not more than one year after the date on which such
Indebtedness is originally incurred to finance the purchase of goods by the
Borrower, (e) obligations under letters of credit in the ordinary course of
business in support of obligations incurred in connection with worker's
compensation, unemployment insurance and other social security legislation, (f)
Indebtedness with respect to Capital Leases to the extent permitted by Section
7.7, (g) any other Indebtedness not exceeding $3,000,000 in aggregate principal
amount at any one time outstanding, (h) Indebtedness from Imperial Bank not to
exceed $1,000,000 pursuant to that Note dated December 22, 1999 executed by the
Borrower in favor of Comerica

                                        4

<PAGE>

Bank (formerly known as Imperial Bank), (i) Indebtedness with respect to the
Convertible Subordinated Notes, (j) Indebtedness which constitutes a Permitted
Investment pursuant to item (viii), (ix), or (x) of the definition of Permitted
Investment; provided all such Indebtedness referred to in this clause (j), (i)
            --------
shall be subordinated in right of payment to the payment in full of the
Obligations pursuant to the terms of the applicable promissory note or an
intercompany subordination agreement, that in any such case, is reasonably
satisfactory to the Administrative Agent and (ii) shall be evidenced by a
promissory note which is subject to a First Priority Lien in favor of the
Collateral Agent pursuant to a Collateral Document, (k) unsecured Indebtedness
(other than by way of intercompany indebtedness) of Foreign Subsidiaries not to
exceed $15,000,000 in the aggregate and (l) extensions, renewals, refundings,
modifications, amendments and restatements of any of the items of Indebtedness
described in clauses (a), (b), (c), (e), (f), (g), (h), (i), (j) and (k) above,
provided that the principal amount thereof is not increased and the terms
thereof are not modified to impose more burdensome terms upon the Borrower.

          1.7  Amendment of Section 7.7: Capital Expenditures.
               ----------------------------------------------

          Section 7.7 shall be amended by deleting the first sentence thereto
and replacing it with the following:

     "The Borrower will not, and shall not permit any of its Subsidiaries to,
directly or indirectly make any Capital Expenditure during any Fiscal Year if,
as a result thereof, the aggregate amount of such expenditures for such Fiscal
Year would exceed $20,000,000 for each of the Fiscal Years ending December 31,
2000 and December 31, 2002 and $35,000,000 for any other Fiscal Year (excluding
Capital Expenditures occurring as a result of a "Permitted Acquisition")."
                                                 ---------------------

          1.8  Amendment of Section 7.9: Maximum Senior Debt to EBITDA.  Section
               --------------------------------------------------------
7.9 shall be amended by deleting in its entirety and substituting the following
therefor:

     "The Borrower will not permit the ratio (the "Senior Leverage Ratio") of
Senior Debt as of the last day of any Fiscal Quarter to EBITDA for the four
Fiscal Quarter period ending on such date to exceed 2.00:1.00; provided that,
                                                               --------
with respect to any measurement of the Senior Leverage Ratio as of the last day
of any Fiscal Quarter in Fiscal Year 2002, such ratio shall be required not to
exceed the correlative ratio indicated as set forth below":

                    --------------------------------------
                        Fiscal Quarter    Senior Leverage
                            Ended              Ratio
                    --------------------------------------
                    March 31, 2002           4.75:1.00
                    --------------------------------------
                    June 30, 2002            4.75:1.00
                    --------------------------------------
                    September 30, 2002       4.00:1.00
                    --------------------------------------
                    December 31, 2002        3.00:1.00
                    --------------------------------------

                                        5

<PAGE>

          1.9  Amendment of Section 7.10: Minimum Fixed Charge Coverage Ratio.
               --------------------------------------------------------------
Section 7.10 shall be amended by deleting the first paragraph thereof in its
entirety and substituting the following therefor:

     "The Borrower will not permit the ratio (the "Fixed Charge Coverage
Ratio"), determined as of the last day of each fiscal quarter, of (a) EBITDA,
less any dividends or other distributions paid to any shareholder or Affiliate
of the Borrower, less any Capital Expenditures made (other than Capital
Expenditures funded with the proceeds of Loans), less cash taxes (net of any
applicable tax refunds, rebates or credits), in each case for the four complete
Fiscal Quarters ended on such day, to (b) the sum of (i) the aggregate amount of
scheduled principal payments on Total Debt (other than the Loans) and the
portion of Capital Lease obligations outstanding on such date which by the terms
of any instrument or agreement relating thereto is due on demand or within one
year from the time of determination, in each case at the last day of such fiscal
quarter, and (ii) the Borrower's and its Subsidiaries, consolidated interest
expense, calculated for the four complete fiscal quarters ended on such last day
of such fiscal quarter, to be less than 1.50 to 1.00; provided, that with
                                                      --------
respect to any measurement of the Fixed Charge Coverage Ratio as of the last day
of the Fiscal Quarter ending September 30 in Fiscal Year 2002, such ratio shall
not be less than 1.25:1.00."

          1.10 Credit Documents. It is agreed that the definition of "Credit
               ----------------
Document" in the Credit Agreement shall include this Amendment and each
Reaffirmation of Guaranty delivered pursuant to Section 3.1(b) hereof.

                          ARTICLE II - LIMITED WAIVER
                          ---------------------------

          2.1  Waiver. Subject to the terms and conditions set forth herein and
               ------
in reliance on the representations and warranties of Borrower herein contained,
Required Banks hereby consent to the following limited waivers:

          (i)  waiver of compliance with the maximum Senior Leverage Ratio
     requirement of 2.00:1.00 as of December 31, 2001 set forth in subsection
     7.9 of the Credit Agreement; and

          (ii) waiver of compliance with the minimum Fixed Charge Coverage Ratio
     requirement of 1.50:1.00 as of December 31, 2001 set forth in subsection
     7.10 of the Credit Agreement.

          2.2  Limitation of Waiver.
               --------------------

     Without limiting the generality of the provisions of subsection 10.13 of
the Credit Agreement, the waiver set forth above shall be limited precisely as
written and relates solely to the waiver and consent to the amendment of the
provisions of the Credit Agreement in the manner and to the extent described
above, and nothing in this Amendment shall be deemed to:

               (a) constitute a waiver of compliance by Borrower or Guarantors
with respect to (i) subsection 3.2 and subsection 3.3 of the Credit Agreement in
any other instance or

                                        6

<PAGE>

(ii) any other term, provision or condition of the Credit Agreement and any
other instrument or agreement referred to therein; or

               (b) prejudice any right or remedy that Administrative Agent or
any Bank may now have (except to the extent such right or remedy was based upon
existing defaults that will not exist after giving effect to this Amendment) or
may have in the future under or in connection with the Credit Agreement or any
other instrument or agreement referred to therein.

     Except as expressly set forth herein, the terms, provisions and conditions
of the Credit Agreement and the other Credit Documents shall remain in full
force and effect and in all other respects are hereby ratified and confirmed.

                  ARTICLE III - REPRESENTATIONS AND WARRANTIES
                  --------------------------------------------

          3.1  Borrower Representations and Warranties. In order to induce the
               ---------------------------------------
Agents and the Banks to enter into this Amendment the Borrower represents and
warrants as follows:

               (a) The Borrower has the power and authority and has taken all
action necessary to execute, deliver and perform this Amendment and all other
agreements and instruments executed or delivered or to be executed or delivered
in connection herewith and therewith and this Amendment and such other
agreements and instruments constitute the valid, binding and enforceable
obligations of the Borrower (except as such enforceability may be limited by (i)
bankruptcy, insolvency, reorganization or other similar laws affecting the
enforcement of creditors rights generally and (ii) general principles of equity
(regardless of whether such enforceability is considered in a proceeding in
equity or at law)).

               (b) After giving effect to the amendments set forth in ARTICLE I
and the waivers set forth in ARTICLE II, the Borrower's representations and
warranties contained in the Credit Agreement are true and correct in all
respects on and as of the date hereof as though made on and as of the date
hereof (except representations and warranties made specifically as of another
date which are true and correct as of such other date) and no Default or Event
of Default has occurred and is continuing as of the date hereof.

          3.2  Acknowledgment of Borrower. The Borrower expressly acknowledges
               --------------------------
and agrees that as of the date hereof, it has no offsets, claims or defenses
whatsoever against any of the Indebtedness or Obligations.

                        ARTICLE IV - CONDITIONS PRECEDENT
                        ---------------------------------

          4.1  Conditions to Effectiveness of this Amendment. The effectiveness
               ---------------------------------------------
of this Amendment is subject to the satisfaction of the following conditions:

               (a) Each Guarantor shall have executed and delivered to the Agent
a counterpart to the Reaffirmation of Guaranty in substantially the form of the
Exhibit I attached hereto (the "Reaffirmation of Guaranty").

               (b) The Borrower shall have paid (i) to the Administrative Agent,
for distribution to each Bank executing this Amendment, an amendment fee equal
to 0.25% of such

                                        7

<PAGE>

Bank's Commitment (prior to the effectiveness of this Amendment); and (ii) all
reasonable fees, costs and expenses owing to the Administrative Agent, the Banks
and the Administrative Agent's counsel through the Second Amendment Effective
Date.

               (c) The Borrower shall deliver to the Administrative Agent all
intercompany promissory notes entered in to between Borrower and its
Subsidiaries to the date hereof which shall comply with the proviso of
subsection 7.4 (j), including, without limitation, intercompany promissory notes
entered into pursuant to clause (x) of the definition of "Permitted
Investments", and which shall otherwise be in form and substance acceptable to
the Administrative Agent.

                         ARTICLE V - GENERAL PROVISIONS
                         ------------------------------

          5.1  Full Force and Effect. Except as expressly amended hereby, the
               ---------------------
Credit Documents and all other documents, agreements and instruments relating to
thereto are and shall remain unmodified and in full force and effect.

          5.2  Counterparts. This Amendment may be executed in any number of
               ------------
counterparts, each of which when so executed and delivered shall be deemed to be
an original and that all of which taken together shall constitute one and the
same instrument, respectively. Delivery of an executed counterpart of this
Amendment by facsimile shall be equally effective as delivery of a manually
executed counterpart of this Amendment. Any party delivering an executed
counterpart by facsimile shall also deliver a manually executed counterpart of
this Amendment, but failure to do so shall not effect the validity,
enforceability, of binding effect of this Amendment.

          5.3  Final Agreement. This Amendment is intended by the Borrower, the
               ---------------
Agents and the Banks to be the final, complete, and exclusive expression of the
agreement between them with respect to the subject matter hereof. This Amendment
supersedes any and all prior oral or written agreements relating to the subject
matter hereof.

          5.4  Effectiveness. This Second Amendment to the Amended and Restated
               -------------
Credit Agreement shall become effective on the date on or before December 31,
2001 on which the later of the following occurs (i) the Borrower, the Required
Banks and each of the Agents and Issuing Banks shall have signed a copy hereof
(whether the same or different copies) and shall have delivered the same to the
Administrative Agent or, in the case of the Banks and Issuing Banks, shall have
given to the Administrative Agent telephone (confirmed in writing), written or
telex notice (actually received) that the same has been signed and mailed to it,
and (ii) the conditions precedent set forth in ARTICLE IV hereof shall be
satisfied or waived in accordance with the terms hereof. The Administrative
Agent will give the Borrower, each Bank and each Issuing Bank prompt written
notice of the occurrence of the Second Amendment Effective Date.

                                        8

<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
duly executed by their duly authorized officers as of the date first above
written.

WIRELESS FACILITIES, INC.               CREDIT SUISSE FIRST BOSTON
as Borrower                             as a Sole Lead Arranger, Administrative
                                        Agent, Collateral Agent, an Issuing Bank
                                        and a Bank
By: /s/ Mike C. Reilly
    --------------------------------
    Name: Mike C. Reilly                By: /s/ Robert Hetu
          --------------------------        ---------------------------------
    Title: Treasurer                        Name: Robert Hetu
           -------------------------              ---------------------------
                                            Title: Director
                                                   --------------------------

                                        By: /s/ Mark E. Gleason
                                            ---------------------------------
                                            Name: Mark E. Gleason
                                                  ---------------------------
                                            Title: Director
                                                   --------------------------

BANK OF AMERICA, N.A.                   COMERICA BANK (formerly known as
as Documentation Agent and              Imperial Bank)
a Bank                                  as Managing Agent, or Issuing Bank and a
                                        Bank

                                        By: /s/ Stephen M. Cusato
                                            ---------------------------------
By: /s/ M. Duncan McDuffie                  Name: Stephen M. Cusato
    --------------------------------              ---------------------------
    Name: M. Duncan McDuffie                Title: Senior Vice President
          --------------------------               --------------------------
    Title: Managing Director
           -------------------------

BANK ONE, N.A. (with its main office in
Chicago, Illinois, successor by merger
with Bank One, Arizona, N.A.)
As a Syndication Agent and a Bank

By: /s/ Gavin Burowail
    --------------------------------
Name: Gavin Burowail
      ------------------------------
Title: Vice President
       -----------------------------

<PAGE>

                                                                       EXHIBIT I

                        FORM OF REAFFIRMATION OF GUARANTY

     THIS REAFFIRMATION OF GUARANTY (this "Reaffirmation"), dated as of December
31, 2001, is made by the undersigned ____________________ (the "Guarantor"), in
favor of Credit Suisse First Boston, a bank organized under the laws of
Switzerland, acting through its New York Branch ("CSFB"), as administrative
agent and collateral agent (the "Agent") for the various Banks (the "Banks")
from time to time party to the Credit Agreement, dated as of August 18, 1999 (as
the same has been amended, restated, supplemented and otherwise modified through
the date hereof (including, without limitation, by the Amended and Restated
Credit Agreement dated as of February 9, 2001 among, inter alios, the Borrower,
CSFB, as Administrative Agent and Collateral Agent, and the Banks (the "Amended
and Restated Credit Agreement")) (the "Agreement"), among, inter alios, Wireless
Facilities, Inc. (the "Borrower"), CSFB, as Administrative Agent and Collateral
Agent and the Banks. Capitalized terms used herein and not otherwise defined
herein shall have the meanings ascribed to such terms in the Credit Agreement.

                               W I T N E S S E T H
                               -------------------

     WHEREAS, the Guarantor has entered into a Guaranty, dated as of August 21,
2000, for the benefit of the Agent and the Banks (as amended, restated,
supplemented and otherwise modified from time to time (including without
limitation by the Reaffirmation of the Guarantee dated as of February 9, 2001
made between the parties hereto), the "Guaranty");

     WHEREAS, the Borrower, the Agent and the Required Banks propose
simultaneously herewith to enter into that certain Second Amendment to the
Amended and Restated Credit Agreement, for the purpose of amending certain
provisions of the Agreement;

     WHEREAS, the execution and delivery of this Reaffirmation is a condition
precedent to the effectiveness of the Second Amendment to the Amended and
Restated Credit Agreement; and

     WHEREAS, the Guarantor desires to confirm that the Guaranty remains in full
force and effect;

     NOW THEREFORE, in order to induce the Agent and the Banks to enter into the
First Amendment to the Amended and Restated Credit Agreement, the Guarantor
hereby agrees as follows:

     1.   Reaffirmation. The Guarantor hereby acknowledges that it has reviewed
          -------------
the terms and provisions of the Second Amendment to the Amended and Restated
Credit Agreement and consents to the amendment of the Credit Agreement pursuant
thereto and in the terms thereof. The Guarantor expressly reaffirms that,
notwithstanding the execution, delivery and effectiveness of the Second
Amendment to the Amended and Restated Credit Agreement

                                  Exhibit I-1

<PAGE>

and any and all other agreements, documents, certificates and instruments
executed and delivered in connection therewith, the Guaranty shall remain in
full force and effect and will continue to guarantee to the fullest extent
possible in accordance with the terms of the Guaranty, the payment and
performance of all of the Guaranteed Obligations (as such term is defined in the
Guaranty) now or hereafter existing under or in respect of the Credit Agreement.

          Except as expressly amended hereby, the Guaranty and all other
documents, agreements and instruments relating thereto are and shall remain
unmodified and in full force and effect.

          2.   Amended and Restated Security Agreement and Pledge Agreement. (a)
               ------------------------------------------------------------
The Guarantor reconfirms the security interest granted to Collateral Agent
pursuant to Section 2 of the Amended and Restated Security Agreement, and hereby
grants to the Collateral Agent a continuing lien on and security interest in and
to all Collateral as collateral security for the prompt payment and performance
in full when due of the Obligations (as such term is defined in the Amended and
Restated Security Agreement) (whether at stated maturity, by acceleration or
otherwise).

               (b)  The Guarantor reconfirms the security interest granted to
Collateral Agent pursuant to Section 3 of the Pledge Agreement dated as of
February 9, 2001, and hereby grants to the Collateral Agent a continuing lien on
and security interest in and to all Collateral as collateral security for the
prompt payment and performance in full when due of the Obligations (as such term
is defined in the Pledge Agreement) (whether at stated maturity, by acceleration
or otherwise).

          3.   Governing Law. THIS REAFFIRMATION AND THE OBLIGATIONS OF THE
               -------------
GUARANTOR HEREUNDER SHALL BE GOVERNED BY, AND SHALL BE CONSTRUED AND ENFORCED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK (INCLUDING SECTION 5-1401 AND
SECTION 5-1402 OF THE NEW YORK GENERAL OBLIGATIONS LAW), BUT OTHERWISE WITHOUT
REFERENCE TO CONFLICTS OF LAW RULES.

                                  Exhibit I-2

<PAGE>

          IN WITNESS WHEREOF, the Guarantor has caused this Reaffirmation to be
executed as of day and year first above written.

                            Wireless Factilities, Inc.
                            --------------------------

                            By:/s/ Mike C. Reilly
                               --------------------------------
                               Name: Mike C. Reilly
                                     --------------------------
                               Title: Treasurer
                                      -------------------------

                            CREDIT SUISSE FIRST BOSTON
                            as Administrative Agent and Collateral Agent

                            By:/s/ Robert Hetu
                               --------------------------------
                               Name:  Robert Hetu
                                      -------------------------
                               Title: Director
                                      -------------------------

                            By:/s/ William S. Lutkins
                               --------------------------------
                               Name: William S. Lutkins
                                     --------------------------
                               Title: Vice President
                                      -------------------------

                                  Exhibit I-3

<PAGE>

                                     Annex A

                                                                      SCHEDULE 1
                                                             TO CREDIT AGREEMENT

      COMMITMENTS/LOANS AS OF EFFECTIVE DATE AFTER MAKING OF INITIAL LOANS
      --------------------------------------------------------------------

Name of Bank                                          Commitment     Loans
------------                                          ----------     -----
Credit Suisse First Boston                            $20,000,000    $10,000,000

Comerica Bank (formerly known as Imperial Bank)       $20,000,000    $10,000,000
Bank of America, N.A.                                 $20,000,000    $10,000,000

BankOne, Arizona, N.A.                                $20,000,000    $10,000,000

         Total                                        $80,000,000    $40,000,000
                                                      ===========    ===========

                                    Annex A

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