<table>
<colgroup>
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</colgroup>
<tbody>
<tr class="odd">
<td></td>
<td colspan="40">OMB Approval #: 2700-0042</td>
<td colspan="7"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="24">amendment of solicitation/</td>
<td colspan="13">1. CONTRACT ID CODE</td>
<td colspan="4">PAGE OF PAGES</td>
<td colspan="6"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="24">modification of contract</td>
<td colspan="13">NAS9-98100</td>
<td colspan="2">1</td>
<td>5</td>
<td colspan="7"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="12">2. AMENDMENT/MODIFICATION NO.</td>
<td colspan="8">3. EFFECTIVE DATE</td>
<td colspan="10">4. REQUISITION/PURCHASE REQ. NO.</td>
<td colspan="10">5. PROJECT NO. <em>(If applicable)</em></td>
<td colspan="7"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="12">Contract Action 191</td>
<td colspan="8">See Block 16C</td>
<td colspan="10">N/A</td>
<td colspan="10"></td>
<td colspan="7"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="8">6. ISSUED BY</td>
<td colspan="4">CODE</td>
<td colspan="8"></td>
<td colspan="11">7. ADMINISTERED BY <em>(If other than Item 6)</em></td>
<td colspan="5">CODE</td>
<td colspan="4"></td>
<td colspan="7"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="21"><p>NASA Lyndon B. Johnson Center</p>
<p>Attn: Lawrence A. Kenyon, PCO, Mail Code BN</p>
<p>2101 Nasa Road One</p>
<p>Houston, Texas 77058</p></td>
<td colspan="20"></td>
<td colspan="6"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="41">8. NAME AND ADDRESS OF CONTRACTOR <em>(No., street,
county, State, and Zip Code)</em></td>
<td colspan="6"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="41"><p>LOCKHEED MARTIN SPACE OPERATIONS COMPANY</p>
<p>Attn: Kathy Collins, Manger of Contracts</p>
<p>595 Gemini Avenue</p>
<p>Houston, Texas 77058</p></td>
<td colspan="6"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="6">CODE</td>
<td colspan="14"></td>
<td colspan="6">FACILITY CODE</td>
<td colspan="14"></td>
<td colspan="7"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="4">(x)</td>
<td colspan="16">9A. AMENDMENT OF SOLICITATION NO.</td>
<td colspan="20">9B. DATED <em>(SEE ITEM 11)</em></td>
<td colspan="7"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="4"></td>
<td colspan="16"></td>
<td colspan="20"></td>
<td colspan="7"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="4"></td>
<td colspan="16">10A. MODIFICATION OF CONTRACT/ORDER NO.</td>
<td colspan="20">10B. DATED <em>(SEE ITEM 13)</em></td>
<td colspan="7"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="4">X</td>
<td colspan="16">NAS9-98100</td>
<td colspan="20">10/01/98</td>
<td colspan="7"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="45">11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF
SOLICITATIONS</td>
<td colspan="2"></td>
</tr>
<tr class="even">
<td colspan="2"></td>
<td></td>
<td colspan="30">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="3">is extended,</td>
<td></td>
<td colspan="4">is not extended.</td>
<td colspan="5"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="45">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>
<td colspan="2"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="13"></td>
<td colspan="2"></td>
<td colspan="28"></td>
<td colspan="4"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="13">(a) By completing Items 8 and 15, and returning</td>
<td colspan="2"></td>
<td colspan="28">copies of the amendment; (b) By acknowledging receipt
of this amendment on each copy of the offor</td>
<td colspan="4"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="45">submitted; or (c) By separate letter or telegram which
includes a reference to the solicitation and amendment numbers. FAILURE
OF YOUR ACKNOWLEDGEMENT TO</td>
<td colspan="2"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="45">BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF
OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN REJECTION
OF</td>
<td colspan="2"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="45">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>
<td colspan="2"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="45">or letter makes reference to the solicitation and this
amendment, and is received prior to the opening hour and date
specified.</td>
<td colspan="2"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="45">12. ACCOUNTING AND APPROPRIATION DATA <em>(If
required)</em></td>
<td colspan="2"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="45"></td>
<td colspan="2"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="40"><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)</p></td>
<td colspan="7"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="5">(x)</td>
<td colspan="41">A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify
authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE</td>
<td></td>
</tr>
<tr class="even">
<td></td>
<td colspan="5"></td>
<td colspan="41">CONTRACT ORDER NO. IN ITEM 10A.</td>
<td></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="5"></td>
<td colspan="41">B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO
REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying
office,</td>
<td></td>
</tr>
<tr class="even">
<td></td>
<td colspan="5"></td>
<td colspan="41">appropriation date, etc.) SET FORTH IN ITEM 14,
PURSUANT TO THE AUTHORITY OF FAR 43.103(b).</td>
<td></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="5"></td>
<td colspan="41">C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT
TO AUTHORITY OF:</td>
<td></td>
</tr>
<tr class="even">
<td></td>
<td colspan="5">X</td>
<td colspan="41">FAR 52.243-2, Alt II (Apr 84) Changes – Cost
Reimbursement</td>
<td></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="5"></td>
<td colspan="41">d. OTHER <em>(Specify type of modification and
authority)</em></td>
<td></td>
</tr>
<tr class="even">
<td></td>
<td colspan="5"></td>
<td colspan="41"></td>
<td></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="7"></td>
<td colspan="3"></td>
<td colspan="3"></td>
<td colspan="2"></td>
<td colspan="10"></td>
<td colspan="2"></td>
<td colspan="20"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="9"><strong>E. IMPORTANT:</strong> Contractor</td>
<td colspan="2"></td>
<td colspan="7">is not,</td>
<td>X</td>
<td colspan="9">is required to sign this document and return</td>
<td>3</td>
<td colspan="18">copies to the issuing office.</td>
</tr>
<tr class="odd">
<td></td>
<td colspan="47"></td>
</tr>
<tr class="even">
<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="odd">
<td></td>
<td colspan="47">I. The purpose of this modification is to definitize
Contract Change Order (CCO) 118. CCO 118 is a credit CCO which removes
the Landsat-7 Mission Operations Center (MOC) services under Contract
Service Level Agreement (CLSA) table B.1A effective 10/01/00. This
modification is agreed to be a complete and equitable adjustment for the
Contractor’s CCO 118 updated proposal dated 02/12/01 and all work set
out in Modification 191<strong>.</strong> The Contractor hereby releases
the Government from any and all liability under this contract for
further equitable adjustment.</td>
</tr>
<tr class="even">
<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="odd">
<td></td>
<td colspan="21">15A. NAME AND TITLE OF SIGNER <em>(Type or
print)</em></td>
<td colspan="23">16A. NAME AND TITLE OF CONTRACTING OFFICER <em>(Type or
print)</em></td>
<td colspan="3"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="21">K.J. Collins, CSOC Contracts Manager</td>
<td colspan="19">Verron M. Brade, Contracting Officer</td>
<td colspan="7"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="16">15B. CONTRACTOR/OFFEROR</td>
<td colspan="4">15C. DATE SIGNED</td>
<td colspan="15">16B. UNITED STATES OF AMERICA</td>
<td colspan="5">16C. DATE SIGNED</td>
<td colspan="7"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="3"></td>
<td colspan="11">Original Signed by Kathy J. Collins</td>
<td colspan="2"></td>
<td colspan="4">4/6/01</td>
<td colspan="3">BY</td>
<td colspan="10">Original Signed by Verron M. Brade</td>
<td colspan="2"></td>
<td colspan="5">4/10/01</td>
<td colspan="7"></td>
</tr>
<tr class="odd">
<td></td>
<td colspan="16"><em>(Signature of person authorized to sign)</em></td>
<td colspan="4"></td>
<td colspan="15"><em>(Signature of Contracting Officer)</em></td>
<td colspan="5"></td>
<td colspan="7"></td>
</tr>
<tr class="even">
<td></td>
<td colspan="17"><p>NSN 7540-01-152-8070</p>
<p>PREVIOUS EDITION UNUSABLE</p></td>
<td colspan="5">30-105</td>
<td colspan="18"><p><strong>STANDARD FORM 30</strong> (Rev. 10-83)</p>
<p>Prescribed by GSA</p>
<p>FAR (48 CFR) 53.243</p></td>
<td colspan="7"></td>
</tr>
</tbody>
</table>

NAS9-98100

Modification 191

Page 2 of 5

I.  [Section B Estimated Cost and Award Fee]{.underline} is updated to
    include the following delta amounts:

    Estimated Cost\* (\$2,618,419)

    Estimated LOE Cost No change

    Total Estimated Cost (\$2,618,419)

Maximum Available Award Fee\*\* (\$209,472)

Maximum Available Lookback Fee (\$ 52,370)

TOTAL CONTRACT VALUE (\$2,880,261)

\* Excluding LOE Cost

\*\* Excluding Lookback Fee

II. OPTION 1 in Section F.4, [OPTION FOR ADDITIONAL EFFORT REQUIRED
    DURING CONTRACT PERFORMANCE]{.underline}, is updated to include the
    following delta amounts:

B.1, entitled \"Estimated Cost and Award Fee\" shall be modified to
reflect the delta reduction of (\$327,905) to the estimated cost and
(\$26,234) to the maximum award fee (excluding the lookback fee) and
(\$6,577) to the maximum available lookback fee.

> NAS9-98100

Modification 191

Page 3 of 5

III. APPENDIX 3, [AWARD FEE DISTRIBUTION]{.underline} is updated to
     include the following delta amounts:

+------------------------------------------------+---------------------+
| Evaluation Period                              | Estimated AF        |
|                                                | Earned/Available    |
+------------------------------------------------+---------------------+
|                                                |                     |
+------------------------------------------------+---------------------+
| # BASIC CONTRACT                               |                     |
+------------------------------------------------+---------------------+
| October 1, 1998- June 30, 1999                 | No change           |
+------------------------------------------------+---------------------+
| July 1, 1999 -- December 31, 1999              | No change           |
+------------------------------------------------+---------------------+
| January 1, 2000 -- June 30, 2000               | No change           |
+------------------------------------------------+---------------------+
| July 1, 2000 -- December 31, 2000              | ## No change        |
+------------------------------------------------+---------------------+
| January 1, 2001 -- June 30, 2001               | ## (\$40,884)       |
+------------------------------------------------+---------------------+
| July 1, 2001 -- December 31, 2001              | (\$40,298)          |
+------------------------------------------------+---------------------+
| January 1, 2002 -- June 30, 2002               | (\$33,744)          |
+------------------------------------------------+---------------------+
| July 1, 2002 -- December 31, 2002              | (\$33,676)          |
+------------------------------------------------+---------------------+
| January 1, 2003 -- June 30, 2003               | (\$30,435)          |
+------------------------------------------------+---------------------+
| July 1, 2003 -- December 31, 2003              | (\$30,435)          |
+------------------------------------------------+---------------------+
|                                                |                     |
+------------------------------------------------+---------------------+
| **Total AF Earned/Available for Basic**        | **(\$209,472)**     |
+------------------------------------------------+---------------------+
|                                                |                     |
+------------------------------------------------+---------------------+
| **OPTION 1 (if exercised)**                    |                     |
+------------------------------------------------+---------------------+
| January 1, 2004 - June 30, 2004                | (\$2,839)           |
+------------------------------------------------+---------------------+
| July 1, 2004 - December 31, 2004               | (\$2,839)           |
+------------------------------------------------+---------------------+
| January 1, 2005 - June 30, 2005                | (\$2,675)           |
+------------------------------------------------+---------------------+
| July 1, 2005 - December 31, 2005               | (\$2,675)           |
+------------------------------------------------+---------------------+
| January 1, 2006 -June 30, 2006                 | (\$2,615)           |
+------------------------------------------------+---------------------+
| July 1, 2006 - December 31, 2006               | (\$2,615)           |
+------------------------------------------------+---------------------+
| January 1, 2007 - June 30, 2007                | (\$2,536)           |
+------------------------------------------------+---------------------+
| July 1, 2007 - December 30, 2007               | (\$2,536)           |
+------------------------------------------------+---------------------+
| January 1, 2008 - June 30, 2008                | (\$2,453)           |
+------------------------------------------------+---------------------+
| July 1, 2008 - December 31, 2008               | (\$2,451)           |
+------------------------------------------------+---------------------+
|                                                |                     |
+------------------------------------------------+---------------------+
| **Total AF Earned/Available for Option 1**     | **(\$26,234)**      |
+------------------------------------------------+---------------------+
|                                                |                     |
+------------------------------------------------+---------------------+
| **"LOOKBACK" PERIOD**                          |                     |
+------------------------------------------------+---------------------+
| October 1, 1998 -- December 31, 2000           | No Change           |
+------------------------------------------------+---------------------+
| January 1, 2001 -- December 31, 2003           | (\$52,370)          |
+------------------------------------------------+---------------------+
| **Total Available LF for Basic**               | **(\$52,370)**      |
+------------------------------------------------+---------------------+
|                                                |                     |
+------------------------------------------------+---------------------+
| **OPTION 1 (if exercised)**                    |                     |
+------------------------------------------------+---------------------+
| January 1, 2004 -- December 31, 2005           | (\$2,756)           |
+------------------------------------------------+---------------------+
| January 1, 2006 -- December 31, 2008           | (\$3,801)           |
+------------------------------------------------+---------------------+
| ####### Total Available LF for Option 1        | **(\$6,557)**       |
+------------------------------------------------+---------------------+

> NAS9-98100

Modification 191

Page 4 of 5

IV\. Delete the following strike-through table entries from contract
service level agreement (CSLA) B.1.A. [Add]{.underline} line for
Landsat-7 PSLA flight dynamics services to Table B.1.A-3.0-B (3a and
3b).

Table B.1.A-3.0-A

  ---------------------------------------------------------------------------------------------
  New       SEID   Service        Address/Location   Ownership   Security   Operating   Notes
  Service          Element                                       Level      Hours       
  Element          Description                                                          
  --------- ------ -------------- ------------------ ----------- ---------- ----------- -------
                                                                                        

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

**Table B.1.A-3.0-B**

  -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  New                                       **CWBS No.                                                                                                                                                  
                                            (Refer to DRD                                                                                                                                               
                                            2.1.1-b)**                                                                                                                                                  
  --------- ----------- ------------------- -------------- --------- --------- --------- --------- --------- --------- --------- -- --------- --------- --------- --------- ------- --------- --------- -------
  Service   Customer    Requirement         **2.4.1.\_**                                                                                                                                                

  Element                                   **1.a**        **1.b**   **2.a**   **2.b**   **3.a**   **3.b**   **4.a**   **4.b**      **5.a**   **5.b**   **6.a**   **6.b**   **7**   **8.b**   **8.d**   **9**

                                                                                                                                                                                                        

                                                                                                                                                                                                        

                                                                                                                                                                                                        

                                                                                                                                                                                                        

                                                                                                                                                                                                        

                                                                                                                                                                                                        

                                                                                                                                                                                                        

                                                                                                                                                                                                        

                                                                                                                                                                                                        

                                                                                                                                                                                                        

  GA040     Landsat-7   Landsat-7 PSLA                                                   X         X                                                                                                    
  -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

> NAS9-98100

Modification 191

Page 5 of 5

# Table B.1.A-4.0 Roles and Responsibilities for the Space Science and Earth-Observing Mission Services

  ------------------------------------------------------------------------------------
  New       RFP       CSOC               GSFC               Responsibilities   Notes
  Service   Service   Responsibilities   Responsibilities   of Other Groups    
  Element   Element                                                            
  --------- --------- ------------------ ------------------ ------------------ -------
            ~~A~~                                                              

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

  -------------------------------------------------------------------------
  Table B.1.A-4.1.0                                            
  ------------------------ ------ ------------- -------------- ------------
  Development Requirement  DP1    NASA          Technical      NASA
                                  Development   Performance    Initiative
                                  Initiative                   Complete

                                                               ~~N/A~~
  -------------------------------------------------------------------------

All other terms and conditions of the contract remain unchanged.

\- End Modification 191-