<table style="width:100%;">
<colgroup>
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<col style="width: 2%" />
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<col style="width: 1%" />
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<col style="width: 2%" />
<col style="width: 0%" />
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<col style="width: 0%" />
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</colgroup>
<tbody>
<tr class="odd">
<td></td>
<td colspan="41">OMB Approval No. 2700-0042</td>
<td colspan="6"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="24">amendment of solicitation/</td>
<td colspan="13">1. CONTRACT ID CODE</td>
<td colspan="6">PAGE OF PAGES</td>
<td colspan="4"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="24">modification of contract</td>
<td colspan="13"></td>
<td colspan="2">1</td>
<td colspan="2">4</td>
<td colspan="6"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="12">2. AMENDMENT/MODIFICATION NO.</td>
<td colspan="8">3. EFFECTIVE DATE</td>
<td colspan="11">4. REQUISITION/PURCHASE REQ. NO.</td>
<td colspan="10">5. PROJECT NO. <em>(If applicable)</em></td>
<td colspan="6"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="12">Contract Action 166</td>
<td colspan="8">See block 16C</td>
<td colspan="11">00285TA1-F(Y)</td>
<td colspan="10"></td>
<td colspan="6"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="9">6. ISSUED BY</td>
<td colspan="3">CODE</td>
<td colspan="8">BN/M41</td>
<td colspan="12">7. ADMINISTERED BY <em>(If other than Item 6)</em></td>
<td colspan="5">CODE</td>
<td colspan="4"></td>
<td colspan="6"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="22"><p>NASA LYNDON B. JOHNSON SPACE CENTER</p>
<p>Attn: Lawrence A. Kenyon, PCO, Mail Code: BN</p>
<p>2101 Nasa Road One</p>
<p>Houston, TX 77058</p></td>
<td colspan="21"></td>
<td colspan="4"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="43">8. NAME AND ADDRESS OF CONTRACTOR <em>(No., street,
county, State, and ZIP Code)</em></td>
<td colspan="4"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="43"><p>LOCKHEED MARTIN SPACE OPERATIONS COMPANY</p>
<p>Attn: Kathy A. Collins, Manager of Contracts</p>
<p>595 Gemini Avenue</p>
<p>Houston, TX 77058</p></td>
<td colspan="4"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="6">CODE</td>
<td colspan="14"></td>
<td colspan="9">FACILITY CODE</td>
<td colspan="12"></td>
<td colspan="6"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="4">(x)</td>
<td colspan="16">9A. AMENDMENT OF SOLICITATION NO.</td>
<td colspan="21">9B. DATED <em>(SEE ITEM 11)</em></td>
<td colspan="6"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="4"></td>
<td colspan="16"></td>
<td colspan="21"></td>
<td colspan="6"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="4"></td>
<td colspan="16">10A. MODIFICATION OF CONTRACT/ORDER NO.</td>
<td colspan="21">10B. DATED <em>(SEE ITEM 13)</em></td>
<td colspan="6"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="4">X</td>
<td colspan="16">NAS 9-98100</td>
<td colspan="21">10/1/98</td>
<td colspan="6"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="47">11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF
SOLICITATIONS</td>
</tr>
<tr class="even">
<td></td>
<td colspan="47"></td>
</tr>
<tr class="odd">
<td colspan="2"></td>
<td></td>
<td colspan="31">The above numbered solicitation is amended as set forth
in Item 14. The hour and date specified for receipt of Offers</td>
<td></td>
<td colspan="3">Is extended,</td>
<td></td>
<td colspan="4">is not extended.</td>
<td colspan="5"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="47">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="odd">
<td></td>
<td colspan="13"></td>
<td colspan="4"></td>
<td colspan="28"></td>
<td colspan="2"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="13">(a) By completing Items 8 and 15, and returning</td>
<td colspan="2"></td>
<td colspan="29">copies of the amendment; (b) By acknowledging receipt
of this amendment on each copy of the offor</td>
<td colspan="3"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="47">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="even">
<td></td>
<td colspan="47">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="odd">
<td></td>
<td colspan="47">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="even">
<td></td>
<td colspan="47">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="odd">
<td></td>
<td colspan="47">12. ACCOUNTING AND APPROPRIATION DATA <em>(If
required)</em></td>
</tr>
<tr class="even">
<td></td>
<td colspan="47">See page 3 Amount : $23,597,397.62</td>
</tr>
<tr class="odd">
<td></td>
<td colspan="41">13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF
CONTRACTS/ORDERS,<br />
IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.(x)</td>
<td colspan="6"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="5">(x)</td>
<td colspan="39">A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify
authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE</td>
<td colspan="3"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="5"></td>
<td colspan="12">CONTRACT ORDER NO. IN ITEM 10A.</td>
<td colspan="24"></td>
<td colspan="6"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="5"></td>
<td colspan="39">B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO
REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying
office,</td>
<td colspan="3"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="5"></td>
<td colspan="39">Appropriation date, etc.) SET FORTH IN ITEM 14,
PURSUANT TO THE AUTHORITY OF FAR 43.103(b).</td>
<td colspan="3"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="5"></td>
<td colspan="39">C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT
TO AUTHORITY OF:</td>
<td colspan="3"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="5"></td>
<td colspan="39"></td>
<td colspan="3"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="5"></td>
<td colspan="39">d. OTHER <em>(Specify type of modification and
authority)</em></td>
<td colspan="3"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="5">X</td>
<td colspan="39">Pursuant to FAR 52.232-22, Limitation of Funds (April
1984)</td>
<td colspan="3"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="8"></td>
<td colspan="3"></td>
<td colspan="2"></td>
<td colspan="4"></td>
<td colspan="11"></td>
<td colspan="2"></td>
<td colspan="17"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="7"><strong>E. IMPORTANT:</strong> Contractor</td>
<td colspan="3">X</td>
<td colspan="3">is not,</td>
<td colspan="3"></td>
<td colspan="9">is required to sign this document and return</td>
<td colspan="2"></td>
<td colspan="19">copies to the issuing office.</td>
<td></td>
</tr>
<tr class="even">
<td></td>
<td colspan="47"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="47">14. description of amendment/modification
<em>(Organized by UCF section headings, including solicitation/contract
subject matter where feasible.)</em></td>
</tr>
<tr class="even">
<td></td>
<td colspan="47"><h1 id="see-page-2">See page 2</h1></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="47">Except as provided herein, all terms and conditions of
the document referenced in Item 9A or 10A, as heretofore changed,
remains unchanged and in full force and effect.</td>
</tr>
<tr class="even">
<td></td>
<td colspan="21">15A. NAME AND TITLE OF SIGNER <em>(Type or
print)</em></td>
<td colspan="22">16A. NAME AND TITLE OF CONTRACTING OFFICER <em>(Type or
print)</em></td>
<td colspan="4"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="21"></td>
<td colspan="20">Karon F. Cox, Contracting Officer</td>
<td colspan="6"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="18">15B. CONTRACTOR/OFFEROR</td>
<td colspan="2">15C. DATE SIGNED</td>
<td colspan="16">16B. UNITED STATES OF AMERICA</td>
<td colspan="5">16C. DATE SIGNED</td>
<td colspan="6"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="3"></td>
<td colspan="11"></td>
<td colspan="4"></td>
<td colspan="2"></td>
<td colspan="3">BY</td>
<td colspan="12"><h2 id="original-signed-by-karon-f.-cox">Original
Signed By: Karon F. Cox</h2></td>
<td></td>
<td colspan="4">12/20/00</td>
<td colspan="7"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="18"><em>(Signature of person authorized to sign)</em></td>
<td colspan="2"></td>
<td colspan="16"><em>(Signature of Contracting Officer)</em></td>
<td colspan="5"></td>
<td colspan="6"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="19">NSN 7540-01-152-8070<br />
PREVIOUS EDITION UNUSABLE</td>
<td colspan="7">30-105<br />
JSC MS Word (Aug 95)</td>
<td colspan="15"><strong>STANDARD FORM 30</strong> (Rev. 10-83)<br />
Prescribed by GSA<br />
FAR (48 CFR) 53.243</td>
<td colspan="6"></td>
</tr>
</tbody>
</table>

> NAS 9-98100
>
> Modification 166
>
> Page 2 of 4

I. The purpose of this Modification 166 is to add incremental funding to
this contract. Clause B.2, CONTRACT FUNDING, is deleted in its entirety
and replaced with the following:

"B.2 CONTRACT FUNDING (NASA 1852.232-81) (JUN 1990)

(a) For the purpose of cost, exclusive of fee, in accordance with the
    Limitation of Funds clause, the total amount allotted by the
    Government to this contract for all efforts is \$811,365,586.95.
    This allotment is for all CSOC efforts and covers the following
    estimated period of performance October 1, 1998 to February 2, 2001.

(b) An additional amount of \$81,136,560.26 is obligated under this
    contract for all efforts for payment of fee.

> (End of Clause)

Funding Recapitulation:

  -------- ------------------ -------- ----------------- -------- ------------------
           Prior Balance               Mod 166                    New Balance

                                                                  

  Cost     \$789,913,407.29            \$21,452,179.66            \$811,365,586.95

  Fee      \$78,991,342.30             \$2,145,217.96             \$81,136,560.26

  Total    \$868,904,749.59            \$23,597,397.62            \$892,502,147.21
  -------- ------------------ -------- ----------------- -------- ------------------

NAS 9-98100

> Modification 166
>
> Page 3 of 4

  ---------------------- ---------------------- ----------------------- ---------------------- ----------------------- ---------------------- ---------------------- ---------------------- ----------------------- --------------------------
  **[FC]{.underline}**   **[RO]{.underline}**   **[OCC]{.underline}**   **[PO]{.underline}**   **[AIN]{.underline}**   **[MA]{.underline}**   **[PY]{.underline}**   **[FS]{.underline}**   **[PWC]{.underline}**   **[Amount]{.underline}**

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      00                     00                     29                     315-40-11-00            \$ 103,405.90

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      00                     01                     29                     329-20-00-00            \$ 25,518.72

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      00                     01                     54                     377-10-10-MA            \$ 1,800,000.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      00                     01                     54                     377-10-10-SI            \$ 400,000.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      00                     01                     52                     479-24-00-00            \$ 490,000.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      00                     01                     52                     479-41-00-00            \$ 250,000.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      00                     01                     29                     624-01-00-00            \$ 477,000.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      00                     01                     29                     729-04-10-01            \$ 112,390.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      00                     01                     29                     729-18-10-01            \$ 842,156.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      00                     01                     29                     729-18-10-SD            \$ 66,000.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      00                     01                     29                     729-19-10-01            \$ 604,997.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      00                     01                     29                     729-19-10-SD            \$ 11,000.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      00                     01                     29                     729-21-10-01            \$ 29,952.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      00                     01                     29                     729-24-10-01            \$ 56,265.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      00                     01                     29                     729-25-10-01            \$ 84,201.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      00                     01                     29                     729-31-10-01            \$ 195,050.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      00                     01                     29                     860-10-00-00            \$ 84,775.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      21                     01                     29                     263-10-06-00            \$ 187.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      51                     00                     29                     258-10-16-SD            \$ 1,816,952.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      51                     01                     29                     259-10-10-SD            \$ 199,902.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      51                     00                     29                     359-04-03-00            \$ 5,000.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      51                     01                     29                     370-03-04-SD            \$ 44,942.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      51                     00                     29                     419-04-01-SD            \$ 25,000.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      51                     00                     29                     428-12-70-SD            \$ 196,000.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      51                     01                     29                     428-12-70-SD            \$ 600,000.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      51                     01                     29                     428-32-03-SD            \$ 305,000.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      51                     01                     29                     428-35-01-00            \$ 1,105,000.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      51                     01                     29                     428-37-01-00            \$ 2,400,000.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      51                     01                     29                     428-66-14-SD            \$ 135,000.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      51                     01                     29                     665-14-04-00            \$ 1,974,000.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      51                     01                     29                     665-15-21-00            \$ 1,992,000.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      51                     01                     29                     665-25-28-00            \$ 2,629,000.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      51                     01                     29                     665-45-01-00            \$ 1,886,000.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      51                     00                     29                     729-03-10-SD            \$ 121,252.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      51                     01                     29                     729-08-10-01            \$ 400,000.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      51                     01                     29                     729-10-10-01            \$ 369,000.00

                                                                                                                                                                                                                    

  4A                     TA                     2540                    TA11                   72                      51                     01                     43                     773-10-00-00            \$ 1,624,750.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      51                     01                     29                     784-12-06-SD            \$ 116,702.00

                                                                                                                                                                                                                    

  6A                     TA                     2540                    TA11                   72                      51                     00                     29                     839-50-30-00            \$ 19,000.00

                                                                                                                                                                                                                    

                                                                                                                                                                                            **TOTAL**               **\$ 23,597,397.62**
  ---------------------- ---------------------- ----------------------- ---------------------- ----------------------- ---------------------- ---------------------- ---------------------- ----------------------- --------------------------