<table style="width:100%;">
<colgroup>
<col style="width: 1%" />
<col style="width: 1%" />
<col style="width: 2%" />
<col style="width: 1%" />
<col style="width: 0%" />
<col style="width: 3%" />
<col style="width: 12%" />
<col style="width: 0%" />
<col style="width: 0%" />
<col style="width: 0%" />
<col style="width: 1%" />
<col style="width: 3%" />
<col style="width: 0%" />
<col style="width: 1%" />
<col style="width: 0%" />
<col style="width: 1%" />
<col style="width: 0%" />
<col style="width: 0%" />
<col style="width: 2%" />
<col style="width: 12%" />
<col style="width: 1%" />
<col style="width: 2%" />
<col style="width: 4%" />
<col style="width: 2%" />
<col style="width: 3%" />
<col style="width: 0%" />
<col style="width: 0%" />
<col style="width: 7%" />
<col style="width: 2%" />
<col style="width: 0%" />
<col style="width: 0%" />
<col style="width: 1%" />
<col style="width: 1%" />
<col style="width: 2%" />
<col style="width: 1%" />
<col style="width: 1%" />
<col style="width: 2%" />
<col style="width: 4%" />
<col style="width: 7%" />
<col style="width: 0%" />
</colgroup>
<tbody>
<tr class="odd">
<td></td>
<td colspan="39">OMB Approval #: 2700-0042</td>
</tr>
<tr class="even">
<td></td>
<td colspan="22">amendment of solicitation/</td>
<td colspan="13">1. CONTRACT ID CODE</td>
<td colspan="4">PAGE OF PAGES</td>
</tr>
<tr class="odd">
<td></td>
<td colspan="22">modification of contract amendment of
solicitation/modification of contract</td>
<td colspan="13"></td>
<td colspan="2">1</td>
<td colspan="2">8</td>
</tr>
<tr class="even">
<td></td>
<td colspan="11">2. AMENDMENT/MODIFICATION NO.</td>
<td colspan="8">3. EFFECTIVE DATE</td>
<td colspan="11">4. REQUISITION/PURCHASE REQ. NO.</td>
<td colspan="9">5. PROJECT NO. <em>(If applicable)</em></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="11">257</td>
<td colspan="8">See Block 16c</td>
<td colspan="11"></td>
<td colspan="9"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="7">6. ISSUED BY</td>
<td colspan="4">CODE</td>
<td colspan="8">BH/H96</td>
<td colspan="12">7. ADMINISTERED BY <em>(If other than Item 6)</em></td>
<td colspan="3">CODE</td>
<td colspan="5"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="19"><p>Attn: BH/Susan L. Stefanovic</p>
<p>2101 NASA Rd. 1</p>
<p>Houston, TX. 77058</p></td>
<td colspan="20"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="39">8. NAME AND ADDRESS OF CONTRACTOR <em>(No., street,
county, State, and Zip Code)</em></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="39"><p>Lockheed Martin Space Operations</p>
<p>Attn.: Ms. Mary J. Parry/C79</p>
<p>2400 NASA Rd. 1</p>
<p>P.O. Box 58561</p>
<p>Houston, TX. 77058</p></td>
</tr>
<tr class="even">
<td></td>
<td colspan="5">CODE</td>
<td colspan="14"></td>
<td colspan="5">FACILITY CODE</td>
<td colspan="15"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="4">(x)</td>
<td colspan="15">9A. AMENDMENT OF SOLICITATION NO.</td>
<td colspan="20">9B. DATED <em>(SEE ITEM 11)</em></td>
</tr>
<tr class="even">
<td></td>
<td colspan="4"></td>
<td colspan="15"></td>
<td colspan="20"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="4"></td>
<td colspan="15">10A. MODIFICATION OF CONTRACT/ORDER NO.</td>
<td colspan="20">10B. DATED <em>(SEE ITEM 13)</em></td>
</tr>
<tr class="even">
<td></td>
<td colspan="4">X</td>
<td colspan="15">NAS 9-19100</td>
<td colspan="20">1/1/94</td>
</tr>
<tr class="odd">
<td></td>
<td colspan="39">11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF
SOLICITATIONS</td>
</tr>
<tr class="even">
<td colspan="2"></td>
<td></td>
<td colspan="25">The above numbered solicitation is amended as set forth
in Item 14. The hour and date specified for receipt of Offers</td>
<td colspan="2"></td>
<td colspan="6">is extended,</td>
<td></td>
<td colspan="2">is not extended.</td>
<td></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="39">Offers must acknowledge receipt of this amendment prior
to the hour and date specified in the solicitation or as amended, by one
of the following methods:</td>
</tr>
<tr class="even">
<td></td>
<td colspan="12"></td>
<td colspan="2"></td>
<td colspan="25"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="12">(a) By completing Items 8 and 15, and returning</td>
<td colspan="2"></td>
<td colspan="25">copies of the amendment; (b) By acknowledging receipt
of this amendment on each copy of the offor</td>
</tr>
<tr class="even">
<td></td>
<td colspan="39">submitted; or (c) By separate letter or telegram which
includes a reference to the solicitation and amendment numbers. FAILURE
OF YOUR ACKNOWLEDGEMENT TO</td>
</tr>
<tr class="odd">
<td></td>
<td colspan="39">BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF
OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN REJECTION
OF</td>
</tr>
<tr class="even">
<td></td>
<td colspan="39">YOUR OFFER. If by virtue of this amendment you desire
to change an offer already submitted, such change may be made by
telegram or letter, provided each telegram</td>
</tr>
<tr class="odd">
<td></td>
<td colspan="39">or letter makes reference to the solicitation and this
amendment, and is received prior to the opening hour and date
specified.</td>
</tr>
<tr class="even">
<td></td>
<td colspan="39">12. ACCOUNTING AND APPROPRIATION DATA <em>(If
required)</em></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="39"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="39"><p>13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF
CONTRACTS/ORDERS,</p>
<p>IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.(x)
(x)</p></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="4">(x)</td>
<td colspan="35">A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify
authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE</td>
</tr>
<tr class="even">
<td></td>
<td colspan="4"></td>
<td colspan="35">CONTRACT ORDER NO. IN ITEM 10A.</td>
</tr>
<tr class="odd">
<td></td>
<td colspan="4"></td>
<td colspan="35">B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO
REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying
office,</td>
</tr>
<tr class="even">
<td></td>
<td colspan="4"></td>
<td colspan="35">appropriation date, etc.) SET FORTH IN ITEM 14,
PURSUANT TO THE AUTHORITY OF FAR 43.103(b).</td>
</tr>
<tr class="odd">
<td></td>
<td colspan="4"></td>
<td colspan="35">C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT
TO AUTHORITY OF:</td>
</tr>
<tr class="even">
<td></td>
<td colspan="4">X</td>
<td colspan="35">10 U.S.C. 2304(c)(1)</td>
</tr>
<tr class="odd">
<td></td>
<td colspan="4"></td>
<td colspan="35">d. OTHER <em>(Specify type of modification and
authority)</em></td>
</tr>
<tr class="even">
<td></td>
<td colspan="4"></td>
<td colspan="35"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="6"></td>
<td colspan="3"></td>
<td colspan="3"></td>
<td colspan="2"></td>
<td colspan="9"></td>
<td colspan="2"></td>
<td colspan="14"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="8"><strong>E. IMPORTANT:</strong> Contractor</td>
<td colspan="2"></td>
<td colspan="7">is not,</td>
<td>x</td>
<td colspan="8">is required to sign this document and return</td>
<td colspan="2">3</td>
<td colspan="11"><p>copies to the issuing office</p>
<p><strong>IMPORTANT:</strong> Contractor is not, is required to sign
this document and return copies to the issuing office.</p></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="39"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="39">14. description of amendment/modification
<em>(Organized by UCF section headings, including solicitation/contract
subject matter where feasible.)</em></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="39"><p>The purpose of this modification is to extend the
contract period of performance through September 30, 2004 and
incorporate three 1-month options in Section F.8. Estimated cost is
increased by $136,460,000, award fee is increased by $8,460,000, and
total contract value is increased by $144,920,000.</p>
<p>This Supplemental Agreement precludes any further claims arising out
of the indirect cost ceilings identified in Clause G.10. In addition,
the contractor agrees to provide earned value variance reports and
electronic TWP basis-of-estimates in contractor format for the extension
period.</p></td>
</tr>
<tr class="even">
<td></td>
<td colspan="39"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="19">15A. NAME AND TITLE OF SIGNER <em>(Type or
print)</em></td>
<td colspan="20">16A. NAME AND TITLE OF CONTRACTING OFFICER <em>(Type or
print)</em></td>
</tr>
<tr class="even">
<td></td>
<td colspan="19">Mary J. Parry, SEAT Contract Manager</td>
<td colspan="20">Robin P. Chapman, Contracting Officer</td>
</tr>
<tr class="odd">
<td></td>
<td colspan="15">15B. CONTRACTOR/OFFEROR15B. CONTRACTOR/OFFEROR</td>
<td colspan="4">15C. DATE SIGNED</td>
<td colspan="14">16B. UNITED STATES OF AMERICA</td>
<td colspan="6">16C. DATE SIGNED</td>
</tr>
<tr class="even">
<td></td>
<td colspan="3"></td>
<td colspan="10"></td>
<td colspan="2"></td>
<td colspan="4"></td>
<td colspan="2">BY</td>
<td colspan="11"></td>
<td></td>
<td colspan="6"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="15"><em>(Signature of person authorized to sign)</em></td>
<td colspan="4"></td>
<td colspan="14"><em>(Signature of Contracting Officer)</em></td>
<td colspan="6"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="16"><p>NSN 7540-01-152-8070</p>
<p>PREVIOUS EDITION UNUSABLE</p></td>
<td colspan="4">30-105</td>
<td colspan="19"><p><strong>STANDARD FORM 30</strong> (Rev. 10-83)</p>
<p>Prescribed by GSA</p>
<p>FAR (48 CFR) 53.243</p></td>
</tr>
</tbody>
</table>

NAS 9-19100

Supplemental Agreement 257

Page 2 of 8

I. Clause B.2 ESTIMATED COST AND AWARD FEE (NASA 18-52.216-85) (DEC
1991) is deleted in its entirety and replaced by the following:

  ------------------- -------------------- --------------------- ------------------- ---------------------
  **Mod 257**                              Estimated Cost        Award Fee           Total

                                                                                     

  CLIN 1- LOE (prior                       \$785,930,100         \$45,067,438        \$830,997,538
  to 10/1/98)                                                                        

                                                                                     

  CLIN 1a - LOE                                                                      
  (after 10/1/98)                                                                    

                      Mod 185              \$293,805,263         \$15,277,874        \$309,083,137

                      **Mod 257**          **\$20,469,000**      **\$1,269,000**     **\$21,738,000**

                      **Total**            **\$314,274,263**     **\$16,546,874**    **\$330,821,137**

                                                                                     

  CLIN 2 - IDIQ (NTE)                                                                

                      Mod 264              \$440,228,732         \$22,891,938        \$463,120,670

                      **Mod 257**          **\$115,991,000**     **\$7,191,000**     **\$123,182,000**

                      **Total**            **\$556,219,732**     **\$30,082,938**    **\$586,302,670**

                                                                                     

  CLIN 3 -                                                                           
  PERFORMANCE-BASED                                                                  

                      S/A 264              \$166,780,042         \$8,672,518         \$175,452,560

                                                                                     

  **Total**                                **\$1,823,204,137**   **\$100,369,768**   **\$1,923,573,905**

                                                                                     

                                                                                     

                                                                                     

                                           (End of Clause)                           

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

NAS 9-19100

Supplemental Agreement 257

Page 3 of 8

II\. F.2 PERIOD OF PERFORMANCE (NASA 18-52.212-74) (DEC 1988)

The period of performance for this contract shall be May 1, 1993 until
**September 30, 2004**.

(End of clause)

III\. Section F.8 is incorporated as follows:

**F.8** **OPTION** **TO EXTEND PERIOD OF PERFORMANCE (JSC 52.217-90)
(APRIL 1993)**

**The Government may require the Contractor to continue to perform
services under this contract. The Contracting Officer may exercise this
option by issuance of a unilateral contract modification 20 days or more
before the end of the period of performance set forth in Section F.**

**Should the option be exercised, the resultant contract will include
all terms and conditions of the basic contract as it exists immediately
prior to the exercise of the option, except for the following changes:**

## Option 1

**1)** **H.6** **entitled \"Level of Effort (Cost)\" shall be modified
by increasing the total direct**

**labor-hours .**

**2)** **B.2** **entitled \"Estimated Cost and Award Fee\" shall be
modified to reflect the addition of** **\$10,041,000** **to the
estimated cost, \$0 to the base fee, and** **\$623,000** **to the
maximum award fee.**

**3)** **H.9 entitled \"Materials and Subcontracts Adjustment
Provision\" shall be modified by increasing the target cost by.**

**4)** **F.2 entitled \"Period of Performance\" shall be modified to
extend the ending date to October 31, 2004.**

**5)** **Overtime premium shall be increased by.**

**Option 2**

**1)** **H.6 entitled \"Level of Effort (Cost)\" shall be modified by
increasing the total direct labor-hours by.**

NAS 9-19100

Supplemental Agreement 257

Page 4 of 8

**2)** **B.1 entitled \"Estimated Cost and Award Fee\" shall be modified
to reflect the addition of \$14,398,000** **to the estimated cost, \$0
to the base fee, and \$893,000** **to the maximum award fee.**

**3)** **H.9 entitled \"Materials and Subcontracts Adjustment
Provision\" shall be modified by increasing the target cost by.**

**4)** **F.2 entitled \"Period of Performance\" shall be modified to
extend the ending date to November 30, 2004.**

**5)** **Overtime premium shall be increased by.**

**Option 3**

**1)** **H.6 entitled \"Level of Effort (Cost)\" shall be modified by
increasing the total direct labor-hours by.**

**2) B.2** **entitled \"Estimated Cost and Award Fee\" shall be modified
to reflect the addition of**

**\$12,314,000** **to the estimated cost, \$0 to the base fee, and
\$763,000** **to the maximum award fee.**

**3)** **H.9 entitled \"Materials and Subcontracts Adjustment
Provision\" shall be modified by increasing the target cost by.**

**4)** **F.2 entitled \"Period of Performance\" shall be modified to
extend the ending date to** **December 31, 2004.**

**5)** **Overtime premium shall be increased by.**

## 

**(End of Clause)**

IV\. Section G.2 is modified as follows:

G.2 SUBMISSION OF VOUCHERS FOR PAYMENT (NASA 18-52.216-87) (DEC 1988)

\(a\) Public vouchers for payment of costs shall include a reference to
this contract NAS 9-19100 and be forwarded to:

NAS 9-19100

Supplemental Agreement 257

Page 5 of 8

**By Mail/Check:**

**Lockheed Martin Services, Inc.**

**Attention: Accounts Receivable**

**2339 Route 70 West, Floor 4W**

**Cherry Hill, NJ 08358-0001**

**By Electronic Funds Transfer:**

**CitiBank N.A.**

**ABA #0210 00089**

**Lockheed Martin Services, Inc.**

**Account #4067 8203**

This is the designated billing office for cost vouchers for purposes of
the Prompt Payment clause of this contract.

\(b\) The Contractor shall prepare vouchers as follows:

\(1\) One original Standard Form (SF) 1034, SF 1035, or equivalent
Contractor\'s attachment.

\(2\) Seven copies of SF 1034A, SF 1035A, or equivalent Contractor\'s
attachment.

\(3\) The Contractor shall mark SF 1034A copies 1, 2, 3, 4, and such
other copies as may be directed by the Contracting Officer by insertion
in the memorandum block the names and addresses as follows:

\(i\) Copy 1 NASA Contracting Officer;

\(ii\) Copy 2 Auditor;

\(iii\) Copy 3 Contractor;

\(iv\) Copy 4 Contract administration office; and

\(v\) Copy 5 Project management office.

\(c\) Public vouchers for payment of fee shall be prepared similarly and
be forwarded to:

NAS 9-19100

Supplemental Agreement 257

#### Page 6 of 8

NASA Lyndon B. Johnson Space Center

Attn: Contracting Officer

Houston, TX 77058

This is the designated billing office for fee vouchers for purposes of
the Prompt Payment clause of this contract.

\(d\) In the event that amounts are withheld from payment in accordance
with provisions of this contract, a separate voucher for the amount
withheld will be required before payment for that amount may be made.

(End of clause)

VI\. H.6 Level-of-Effort (COST) (NASA 1852.216-82) (DEC 1991),
subparagraph (a), is modified as follows:

\(a\) During the term of the contract, the Contractor is obligated to
provide not less than 80 percent nor more than

VII\. H.7 Key Personnel and Facilities, subparagraph (c) is modified as
follows:

\(c\) The list of personnel and/or facilities (shown below or as
specified in the contract Schedule) may, with the consent of the
contracting parties, be amended from time to time during the course of
the contract to add or delete personnel and/or facilities.

(End of clause)

NAS 9-19100

Supplemental Agreement 257

Page 7 of 8

VIII\. H.9 Materials and Subcontracts -- Adjustment Provision, Paragraph
A is modified as follows:

A. The performance of tasks under this contract will in some instances
require the Contractor to furnish materials, commercially available
products, or subcontracted items (hereafter collectively referred to as
"materials") that may be charged as direct costs to this contract
pursuant to the "Allowable Cost and Payment" clause hereof. It is
anticipated that the total cost of such items will fall in a range of

IX\. Attachment J-1, Performance and Award Fee Plan, Paragraph V, is
modified as follows:

V. ESTIMATED COST

The contractor shall continue to report the original ETA and SPDEO
negotiated contract baselines in the NF 533M. Since the 533M report
columns 7b and 7d, Prior Month Plan and Cum Plan, will not be revised,
the following formulas will be used to establish the estimated cost for
the fiscal year:

The cost baseline for completion-form effort (PB SOW and IDIQ tasks)
will be established using the rates listed in Appendix 5 (LM Labor
Rates), Appendix 6 (Subcontractor Labor Rates), and Appendix 7 (**IDIQ
Material/Travel/OTP Burden Rate Target Rates)**. As indicated in the
formula below, the applicable hours by skill mix are multiplied by the
negotiated direct labor rates (Appendix 5) or subcontractor rates
(Appendix 6) in each Basis of Estimate (BOE). The BOE travel, material,
and overtime premium costs multiplied by the negotiated **IDIQ
Material/Travel/OTP Burden Rate Target Rate** (Appendix 7) are then
added to the labor dollar estimate to establish the estimated TWP cost.

TWP Estimated Cost = (BOE LM DL Hrs by skill mix) x (Appendix 5 LM Labor
rate) + (BOE sub DL Hrs by skill mix) x (Appendix 6 sub labor rate) +
(BOE material, travel, Overtime Premium) x (Appendix 7 **IDIQ
Material/Travel/OTP Burden Rate Target Rate)**.

X. Appendix 3, Award Fee Distribution, is replaced by the following:

APPENDIX 3 - AWARD FEE DISTRIBUTION

EVALUATION PERIOD ESTIMATED AWARD FEES AVAILABLE

January 1, 1994 - March 31, 1994 \$

April 1, 1994 - September 30, 1994 \$

October 1, 1994 - March 31, 1995 \$

April 1, 1995 - September 30, 1995 \$

October 1, 1995 - March 31, 1996 \$

NAS 9-19100

Supplemental Agreement 257

#### Page 8 of 8

April 1, 1996 - September 30, 1996 \$

October 1, 1996 - March 31, 1997 \$

April 1, 1997 - September 30, 1997 \$

October 1, 1997 - March 31, 1998 \$

April 1, 1998 - September 30, 1998 \$

October 1, 1998 - March 31, 1999\* \$

April 1, 1999 - September 30, 1999\* \$

October 1, 1999 - March 31, 2000\* \$

April 1, 2000 - September 30, 2000\* \$

October 1, 2000 - March 31, 2001\* \$

April 1, 2001 - September 30, 2001\* \$

October 1, 2001 - March 31, 2002\* \$

April 1, 2002 - September 30, 2002\* \$

October 1, 2002 - March 31, 2003\* \$

April 1, 2003 - September 30, 2003\* \$

October 1, 2003 - **March 31, 2004\* \$**

**April 1, 2004-September 30, 2004\* \$**

-   The available award fee pool at the end of each fiscal year
    evaluation period is defined to be 5.2% of target cost **for the
    period October 1, 1998 through December 31, 2003** **and 6.2% of
    target cost for the period January 1, 2004 through September 30,
    2004 and options, if exercised.** The target cost will be adjusted
    to address any effort that is not completed as of the end of the
    fiscal year.

-   The available award fee pool for the first evaluation period of each
    fiscal year will be based on 50% of the target cost (See Section VI)
    as of the last day of the evaluation period **X times the applicable
    fee rate stated above**.

-   The target cost of the effort accomplished during the second award
    fee period of the fiscal year will be based upon the target costs
    for the year less the target cost used for the first award fee
    period. The maximum award fee pool for the second award fee period
    will be applicable fee rate times the target cost less the maximum
    award fee pool made available during the first award fee period.

XI\. Appendices 5, 6, 7, and 8 are revised per the attached replacement
pages.