Raytheon Technologies Corp., Pratt and Whitney Military Engines, East Hartford, Conn., is awarded a not-to-exceed $511,589,719 modification (P00025) to a previously awarded cost-plus-incentive-fee, cost-plus-fixed-fee, cost reimbursable, and fixed-price incentive (firm target) undefinitized contract (N0001921C0011). This modification provides for F135 propulsion system annual sustainment including recurring sustainment support, program management, financial and administrative activities, propulsion integration, replenishment spare part buys, engineering support, material management, configuration management, product management support, software sustainment, security management, joint technical data updates, support equipment management, depot level maintenance and repair for all fielded propulsion systems at the F-35 production sites and operational locations, as well as training. These efforts are in support of the F-35 Lightning II aircraft for the Air Force, Marine Corps, Navy, non-U.S. Department of Defense (DOD) participants, and Foreign Military Sales (FMS) customers. Work will be performed in East Hartford (40%); Oklahoma City, Okla. (21%); Indianapolis, Ind. (12%); Windsor Locks, Conn. (6%); West Palm Beach, Fla. (6%); Brekstad, Norway (4%); Leeuwarden, Netherlands (3%); Iwakuni, Japan (3%); Williamtown, Australia (2%); Cameri, Italy (1%); Marham, United Kingdom (1%); and Fort Worth, Texas (1%), and is expected to be completed in May 2023. Fiscal 2023 operation and maintenance (Air Force) funds in the amount of $38,863,770; fiscal 2023 operation and maintenance (Marine Corps) funds in the amount of $25,890,796; fiscal 2023 operation and maintenance (Navy) funds in the amount of $8,315,050; non-U.S. DOD participant funds in the amount of $23,125,291; and FMS funds in the amount of $12,102,937 will be obligated at time of award, $73,069,616 of which will expire at the end of the current fiscal year. The Naval Air Systems Command, Patuxent River, Md., is the contracting activity. (Source: DoD, 11/29/22) Gulf Coast note: Eglin Air Force Base, Fla., is home of an F-35 training center and reprogramming labs.