Raytheon Technologies Corp., Pratt and Whitney Military Engines, East Hartford, Connecticut, is awarded a not-to-exceed $380,604,448 modification (P00053) to a previously awarded, cost-plus-incentive-fee, fixed-price incentive (firm-target), cost-plus-fixed-fee, cost reimbursable contract (N0001921C0011). This modification adds scope and increases contract ceiling to provide for F135 propulsion system annual sustainment including 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, and support equipment management. Additionally, this effort includes depot level maintenance and repair for all fielded propulsion systems at the F-35 production sites and operational locations, as well as training 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, Connecticut (40%); Oklahoma City, Oklahoma (21%); Indianapolis, Indiana (12%); Windsor Locks, Connecticut (6%); West Palm Beach, Florida (6%); Brekstad, Norway (4%); Leeuwarden, Netherlands (3%); Iwakuni, Japan (3%); Williamtown, New South Wales, Australia (2%); (1%); Cameri, Italy, and Marham, United Kingdom (1%); and Fort Worth, Texas (1%), is expected to be completed in August 2024. Fiscal 2024 operations and maintenance (Air Force) funds in the amount of $91,144,011; fiscal 2024 operations and maintenance (Marine Corps) funds in the amount of $54,514,229; fiscal 2024 operations and maintenance (Navy) funds in the amount of $16,667,989; non-U.S. DOD participant funds in the amount of $49,397,375; and FMS funds in the amount of $25,311,056, will be obligated at time of award, $162,326,229, none of which will expire at the end of the current fiscal year. Naval Air Systems Command, Patuxent River, Maryland, is the contracting activity.