Exhibit 10.1

EXTENSION AGREEMENT

Bank of America, N.A.,
as Administrative Agent
under the Five-Year Credit Agreement referred to below

Ladies and Gentlemen:

The undersigned hereby agrees to extend, effective October 9, 2017, the
Commitment Termination Date under the Five-Year Credit Agreement dated as of
October 9, 2015 (as amended from time to time, the “Five-Year Credit Agreement”)
among, inter alios, Lockheed Martin Corporation, the Lenders party thereto and
Bank of America, N.A., as Administrative Agent, for one year to October 9, 2022.
Terms defined in the Five-Year Credit Agreement are used herein with the same
meaning.

This Extension Agreement shall be construed in accordance with and governed by
the laws of the State of New York.

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AUSTRALIA AND NEW ZEALAND BANKING GROUP LIMITED

By: /s/ Robert Grillo                                                    
Name: Robert Grillo
Title: Director

BANK OF AMERICA, N.A.

By: /s/ Prathamesh
Kshirsagar                                                    
Name: Prathamesh Kshirsagar
Title: Vice President

THE BANK OF TOKYO-MITSUBISHI UFJ, LTD

By: /s/ Maria Iarriccio                                                    
Name: Maria Iarriccio
Title: Director

BARCLAYS BANK PLC

By: /s/ Craig Malloy                                                    
Name: Craig Malloy
Title: Director

CITIBANK, N.A.

By: /s/ Michael Vondriska                                                    
Name: Michael Vondriska
Title: Vice President

[Lockheed – Extension Agreement]

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CREDIT AGRICOLE CORPORATE AND INVESTMENT BANK

By: /s/ Mark Koneval                                                    
Name: Mark Koneval
Title: Managing Director
 
By: /s/ Gary Herzog                                                   
Name: Gary Herzog
Title: Managing Director

CREDIT INDUSTRIEL ET COMMERCIAL

By: /s/ Nicolas Regent                                                    
Name: Nicolas Regent
Title: VP, Corporate Banking
 
By: /s/ Clifford Abramsky                                                   
Name: Clifford Abramsky
Title: MD, Corporate Finance

GOLDMAN SACHS BANK USA

By: /s/ Ryan Durkin                                                    
Name: Ryan Durkin
Title: Authorized Signatory

JPMORGAN CHASE BANK, N.A.

By: /s/ Robert P. Kellas                                                    
Name: Robert P. Kellas
Title: Executive Director

LLOYDS BANK PLC

By: /s/ Daven Popat                                                    
Name: Daven Popat
Title: Senior Vice President Transaction Execution Category A P003
 
By: /s/ Erin Walsh                                                 
Name: Erin Walsh
Title: Assistant Vice President W004

[Lockheed – Extension Agreement]

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MIZUHO BANK, LTD.

By: /s/ Donna DeMagistris                                                    
Name: Donna DeMagistris
Title: Authorized Signatory

MORGAN STANLEY BANK, N.A.

By: /s/ Michael King                                                    
Name: Michael King
Title: Authorized Signatory

THE NORTHERN TRUST COMPANY

By: /s/ Peter J. Hallan                                                    
Name: Peter J. Hallan
Title: Vice President

RIYAD BANK, HOUSTON AGENCY

By: /s/ Tim Hartnett                                                    
Name: Tim Hartnett
Title: Vice President & Administrative Officer
 
By: /s/ Manny Cafeo                                                  
Name: Manny Cafeo
Title: Operations Manager

ROYAL BANK OF CANADA

By: /s/ Richard C. Smith                                                    
Name: Richard C. Smith
Title: Managing Director

STATE STREET BANK AND TRUST COMPANY

By: /s/ Kimberly R. Costa                                                   
Name: Kimberly R. Costa
Title: Vice President

[Lockheed – Extension Agreement]

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SUMITOMO MITSUI BANKING CORPORATION
By: /s/ James D. Weinstein                                                    
Name: James D. Weinstein
Title: Managing Director

TORONTO DOMINION (NEW YORK) LLC

By: /s/ Pradeep Mehra                                                   
Name: Pradeep Mehra
Title: Managing Director

U.S. BANK NATIONAL ASSOCIATION

By: /s/ Jonathan F. Lindvall                                                    
Name: Jonathan F. Lindvall
Title: Senior Vice President

UNICREDIT BANK AG, NEW YORK BRANCH

By: /s/ Filippo Pappalardo                                                    
Name: Filippo Pappalardo
Title: Managing Director
 
By: /s/ Peter Daugavietis                                                   
Name: Peter Daugavietis
Title: Associate Director

WELLS FARGO BANK, N.A.

By: /s/ Adam Spreyer                                                    
Name: Adam Spreyer
Title: Director

[Lockheed – Extension Agreement]

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Agreed and accepted:

LOCKHEED MARTIN CORPORATION

By: /s/ John W. Mollard                                                    
Name: John W. Mollard
Title: Vice President and Treasurer

BANK OF AMERICA, N.A., as
Administrative Agent

By: /s/ Kyle D. Harding                                                    
Name: Kyle D. Harding
Title: Assistant Vice President

[Lockheed – Extension Agreement]