Lockheed Martin Corp., Lockheed Martin Aeronautics Co., Fort Worth, Texas, is awarded a $79,955,058 firm-fixed-price, cost-plus-fixed-fee modification (P00006) to a previously-awarded indefinite delivery/ indefinite-quantity contract (N0001921D0001). This modification adds scope to procure additional initial spares in support of F-35 Lightning II Lot 17 deliveries for the Air Force, Marine Corps, Navy, Foreign Military Sales customers, and non-U.S. Department of Defense participants. Work will be performed in Fort Worth, Texas, and is expected to be completed in December 2029. No funds are being obligated at time of award; funds will be obligated on individual orders as they are issued. The Naval Air Systems Command, Patuxent River, Maryland, is the contracting activity.