<table style="width:100%;">
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</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">3</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">260</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>NASA/Johnson Space Center</p>
<p>Attn: BH/Susan 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">Net obligation : -$103,270.00</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">X</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"></td>
<td colspan="35"></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">X</td>
<td colspan="7">is not,</td>
<td></td>
<td colspan="8">is required to sign this document and return</td>
<td colspan="2"></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">The purpose of this contract modification is to add
incremental funding and correct the amounts obligated by Modifications
256 and 258.</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"></td>
<td colspan="20">Susan L. Stefanovic, 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

Modification 260

Page 2 of 3

I. Modification 256 is corrected as follows:

SF 30, Block 12, net obligation is changed from **\$12,479,608.29** to
**\$12,525,608.29**.

Page 2, I.10 Limitation of Funds, Paragraph (m), the amount allotted for
payment of cost is changed from **\$1,614,714,581.38** to
**\$1,614,760,581.38**.

Funding Recapitulation is corrected as follows:

  ------------- ---------------------------- --------------------- ----------------------------
                Prior Cumulative             Obligation            Revised Cumulative

                [Through Mod.                [This Mod.            [Obligation]{.underline}
                252]{.underline}             256]{.underline}      

                                                                   

  Total Cost    \$ 1,602,234,973.09          **\$12,525,608.29**   **\$1,614,760,581.38**

  Fee           [\$                          [\$ 0.00]{.underline} [\$
                78,400,000.00]{.underline}                         78,400,000.00]{.underline}

  Total         \$ 1,680,634,973.09          **\$12,525,608.29**   **\$1,693,160,581.38**
  ------------- ---------------------------- --------------------- ----------------------------

PR 4200026122 amount is changed from **\$2,504,967.00** to
**\$2,550,967.00**. PR total and obligations are changed from
**\$12,502,980.12** to **\$12,548,980.12**. Net total is changed from
**\$12,479,608.29** to **\$12,525,608.29**.

II\. Modification 258 is corrected as follows:

SF 30, Block 12, net obligation is changed from **\$9,235,100.38** to
**\$9,067,861.19.**

Page 2, I.10 Limitation of Funds, Paragraph (m), the amount allotted for
payment of cost is changed from **\$1,623,949,681.76** to
**\$1,623,828,442.57**.

Funding Recapitulation is corrected as follows:

  ------------- ---------------------------- ------------------- ----------------------------
                Prior Cumulative             Obligation          Revised Cumulative

                [Through Mod.                [This Mod.          [Obligation]{.underline}
                256]{.underline}             258]{.underline}    

                                                                 

  Total Cost    **\$1, 614,760,581.38**      **\$ 9,067,861.19** **\$1,623,828,442.57**

  Fee           [\$                          [\$                 [\$
                78,400,000.00]{.underline}   0.00]{.underline}   78,400,000.00]{.underline}

  Total         **\$ 1,693,160,581.38**      **\$ 9,067,861.19** **\$1,702,228,442.57**
  ------------- ---------------------------- ------------------- ----------------------------

PR 4200028054 amount is changed from **\$1,412,764.38** to
**\$1,442,397.19**. PR 4200028395 amount is changed from
**\$3,619,655.00** to **\$3,422,783.00**. PR total and obligations are
changed from **\$9,281,800.38** to **\$9,114,561.19**. Net total is
changed from **\$9,235,100.38** to **\$9,067,861.19**.

III\. Section I, Contract Clauses; I-10 **Limitation of Funds** (FAR
52.232-22) (APR 1984) Paragraph (m) is deleted in its entirety and the
following substituted herein:

> "(m) For purposes of payment of cost, exclusive of fee, the total
> amount allotted by the Government to this contract is
> \$1,623,725,172.57. This allotment is for science payload, and
> engineering, test, and analysis services and covers the following
> period of performance**:** May 1, 1993 through September 11, 2003. An
> additional amount of \$78,400,000.00 is obligated under this contract
> for payment of fee."

NAS 9-19100

Modification 260

Page 3 of 3

Funding Recapitulation:

  ------------- ---------------------------- ------------------- ----------------------------
                Prior Cumulative             Obligation          Revised Cumulative

                [Through Mod.                [This Mod.          [Obligation]{.underline}
                258]{.underline}             260]{.underline}    

                                                                 

  Total Cost    \$1,623,828,442.57           \$ -103,270.00      \$1,623,725,172.57

  Fee           [\$                          [\$                 [\$
                78,400,000.00]{.underline}   0.00]{.underline}   78,400,000.00]{.underline}

  Total         \$1,702,228,442.57           **\$ -103,270.00**  **\$1,702,125,172.57**
  ------------- ---------------------------- ------------------- ----------------------------

+--------------------------------------+------+---+---+----+----+------+
| **Obligations:**                     |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|   --------                           |      |   |   |    |    |      |
| ---- ------------------ --------- -- |      |   |   |    |    |      |
| ------------------ --------------- - |      |   |   |    |    |      |
| ---------------- ------------------- |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                  **Deobligations:**  |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|  **PR**       **Amount**         **O |      |   |   |    |    |      |
| rg**                        **PLI**  |      |   |   |    |    |      |
|         **WBS**           **Amount** |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|   4                                  |      |   |   |    |    |      |
| 200028578   \$115,000.00       E272  |      |   |   |    |    |      |
|                           59         |      |   |   |    |    |      |
|       72-959-88-AA      \$135,270.00 |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                            248       |      |   |   |    |    |      |
|        72-375-10         \$83,000.00 |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                             37       |      |   |   |    |    |      |
|         72-477-17-AC      \$2,000.00 |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                            153       |      |   |   |    |    |      |
|        72-477-17-AC      \$33,000.00 |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                             216      |      |   |   |    |    |      |
|         72-477-17-AC      \$5,000.00 |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                            213       |      |   |   |    |    |      |
|        72-949-10-AP      \$24,000.00 |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                             173      |      |   |   |    |    |      |
|         72-949-10-AP      \$2,000.00 |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                            96        |      |   |   |    |    |      |
|        72-376-70-10-CD   \$32,500.00 |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|       **TOTAL**         \$218,270.00 |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|   **TOTAL**    **\$115,000.          |      |   |   |    |    |      |
| 00**                                 |      |   |   |    |    |      |
|   **Net Change**                     |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                       Obligations    |      |   |   |    |    |      |
|                     **\$115,000.00** |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                           Deobligati |      |   |   |    |    |      |
| ons                     \$218,270.00 |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|                                      |      |   |   |    |    |      |
|  **TOTAL**         **-\$103,270.00** |      |   |   |    |    |      |
|   --------                           |      |   |   |    |    |      |
| ---- ------------------ --------- -- |      |   |   |    |    |      |
| ------------------ --------------- - |      |   |   |    |    |      |
| ---------------- ------------------- |      |   |   |    |    |      |
+--------------------------------------+------+---+---+----+----+------+
|                                      |      |   |   |    |    |      |
+--------------------------------------+------+---+---+----+----+------+
|                                      |      |   |   |    |    |      |
+--------------------------------------+------+---+---+----+----+------+
|                                      |      |   |   |    |    |      |
+--------------------------------------+------+---+---+----+----+------+
|                                      |      |   |   |    |    |      |
+--------------------------------------+------+---+---+----+----+------+
|                                      |      |   |   |    |    |      |
+--------------------------------------+------+---+---+----+----+------+
|                                      |      |   |   |    |    |      |
+--------------------------------------+------+---+---+----+----+------+
|                                      |      |   |   |    |    |      |
+--------------------------------------+------+---+---+----+----+------+
|                                      |      |   |   |    |    |      |
+--------------------------------------+------+---+---+----+----+------+
|                                      |      |   |   |    |    |      |
+--------------------------------------+------+---+---+----+----+------+
|                                      |      |   |   |    |    |      |
+--------------------------------------+------+---+---+----+----+------+
|                                      |      |   |   |    |    |      |
+--------------------------------------+------+---+---+----+----+------+
|                                      |      |   |   |    |    |      |
+--------------------------------------+------+---+---+----+----+------+
|                                      |      |   |   |    |    |      |
+--------------------------------------+------+---+---+----+----+------+
|                                      |      |   |   |    |    |      |
+--------------------------------------+------+---+---+----+----+------+
|                                      |      |   |   |    |    |      |
+--------------------------------------+------+---+---+----+----+------+
|                                      |      |   |   |    |    |      |
+--------------------------------------+------+---+---+----+----+------+
|                                      |      |   |   |    |    |      |
+--------------------------------------+------+---+---+----+----+------+
|                                      |      |   |   |    |    |      |
+--------------------------------------+------+---+---+----+----+------+