Lockheed Martin Corp., Lockheed Martin Aeronautics Co., Fort Worth, Texas, is awarded a $20,329,784 undefinitized cost-plus-fixed-fee modification (P00024) to a previously awarded contract (N0001919C0074). This modification procures special tooling and test equipment in support of Block Four electronic warfare capabilities for both production and retrofit modifications for the F-35 Joint Strike Fighter aircraft for the Air Force, Marine Corps, Navy, Foreign Military Sales (FMS) customers, and non-U.S. Department of Defense (DOD) participants. Work will be performed in Nashua, New Hampshire (94%); Orlando, Florida (3%); Linthicum, Maryland (1%); Ocala, Florida (1%); and Lexington, Kentucky (1%), and is expected to be completed in October 2028. Fiscal 2022 aircraft procurement (Navy) funds in the amount of $3,392,214; fiscal 2022 aircraft procurement (Air Force) funds in the amount of $3,392,213; fiscal 2021 aircraft procurement (Air Force) funds in the amount of $2,676,316; fiscal 2021 aircraft procurement (Navy) funds in the amount of $1,607,264; FMS customer funds in the amount of $5,496,510; and non-U.S. DOD participants funds in the amount of $3,765,266, will be obligated at time of award, $4,283,580 of which will expire at the end of the current fiscal year. Naval Air Systems Command, Patuxent River, Maryland, is the contracting activity.