Lockheed Martin (LMT) 10-Q 2021 Q3 Quarterly report

Exhibit 15

Acknowledgment of

Independent Registered Public Accounting Firm

Board of Directors and Stockholders

Lockheed Martin Corporation

We are aware of the incorporation by reference of our report dated October 26, 2021, relating to the unaudited consolidated interim financial statements of Lockheed Martin Corporation that is included in its Form 10-Q for the quarter ended September 26, 2021, in the following Registration Statements of Lockheed Martin Corporation:

•333-92363 on Form S-8, dated December 8, 1999;

•333-115357 on Form S-8, dated May 10, 2004;

•333-155687 on Form S-8, dated November 25, 2008;

•333-176440 on Form S-8, dated August 23, 2011 and April 24, 2020 (Post-Effective Amendment No. 1);

•333-188118 on Form S-8, dated April 25, 2013;

•333-195466 on Form S-8, dated April 24, 2014, July 23, 2014 (Post-Effective Amendment No.1) and April 24, 2020 (Post-Effective Amendment No. 2);

•333-237829, 333-237831, and 333-237832 on Form S-8, each dated April 24, 2020;

•333-237834 on Form S-3, dated April 24, 2020; and

•333-237836 on Form S-3, dated April 24, 2020.

/s/ Ernst & Young LLP

Tysons, Virginia

October 26, 2021