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 August 24, 2019, the
Commitment Termination Date under the Five-Year Credit Agreement dated as of
August 24, 2018 (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 August 24, 2024.
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

BARCLAYS BANK PLC

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

CITIBANK, N.A.

By: /s/ Brian Reed                                                    
Name: Brian Reed
Title: Vice President

CREDIT AGRICOLE CORPORATE AND INVESTMENT BANK

By: /s/ Gordon Yip                                                   
Name: Gordon Yip
Title: Director
 
By: /s/ Gary Herzog                                                   
Name: Gary Herzog
Title: Managing Director

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CREDIT INDUSTRIEL ET COMMERCIAL, NEW YORK BRANCH

By: /s/ Eugene Kenny                                                    
Name: Eugene Kenny
Title: Vice President
 
By: /s/ Nicolas Regent                                                    
Name: Nicolas Regent
Title: Vice President

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 CORPORATE MARKETS PLC

By: /s/ Kamala Basdeo                                         
Name: Kamala Basdeo
Title: Assistant Manager, Transaction Execution, Category A B002
 
By: /s/ Tina Wong                                                
Name: Tina Wong
Title: Assistant Manager, Transaction Execution, Category A W011

MIZUHO BANK, LTD.

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

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MORGAN STANLEY BANK, N.A.

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

MUFG BANK, LTD., as Lender

By: /s/ Thomas Sterr                                                   
Name: Thomas Sterr
Title: Authorized Signatory

THE NORTHERN TRUST COMPANY, as Lender

By: /s/ Kimberly A. Crotty                                                   
Name: Kimberly A. Crotty
Title: Vice President

RIYAD BANK, HOUSTON AGENCY

By: /s/ Michael Meiss                                                    
Name: Michael Meiss
Title: General Manager
 
By: /s/ Manny Cafeo                                                  
Name: Manny Cafeo
Title: Vice President, Operations Manager

ROYAL BANK OF CANADA

By: /s/ Richard C. Smith                                                    
Name: Richard C. Smith
Title: Authorized Signatory

STATE STREET BANK AND TRUST COMPANY

By: /s/ Busola Laguda                                                   
Name: Busola Laguda
Title: Vice President

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SUMITOMO MITSUI BANKING CORPORATION
By: /s/ Michael Maguire                                                    
Name: Michael Maguire
Title: Executive Director

THE TORONTO DOMINION BANK, NEW YORK BRANCH

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

U.S. BANK NATIONAL ASSOCIATION

By: /s/ Ken Gorski                                                    
Name: Ken Gorski
Title: Vice President

UNICREDIT BANK AG, NEW YORK BRANCH

By: /s/ Filippo Pappalardo                                                    
Name: Filippo Pappalardo
Title: Managing Director
 
By: /s/ Tommaso Maiocchi                                                   
Name: Tommaso Maiocchi
Title: Associate Director

WELLS FARGO BANK, N.A.

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

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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