Raytheon Technologies Corp., Pratt and Whitney Military Engines, East Hartford, Connecticut, is awarded a not-to-exceed $4,385,492,639 undefinitized modification (P00005) to a previously awarded cost-plus-incentive-fee, fixed-price incentive (firm-target) contract (N0001920C0011). This modification adds scope for the production and delivery of Lot 15 and 16 F-35 Lighting II Joint Strike Fighter propulsion systems to include 152 F135-PW-100 propulsion systems (108 for the Air Force, 29 for the Navy, and 15 for the Marine Corps); and 26 F135-PW-600 propulsion systems for the Marine Corps, as well as long lead-time components, parts, and materials associated with F135-PW-100 and F135-PW-600 propulsion systems for non-U.S. Department of Defense (DOD) participants and Foreign Military Sales (FMS) customers. Additionally, this modification provides global spares requirements to include spare engines, power modules, and other hardware. This modification also provides a Block 4 Short Take-Off Vertical Landing developmental test engine for flight test efforts. Work will be performed in East Hartford, Connecticut (17%); Indianapolis, Indiana (10%); Middletown, Connecticut (8%); Kent, Washington (7%); North Berwick, Maine (4%); El Cajon, California (3%); Cromwell, Connecticut (3%); Whitehall, Michigan (3%); Portland, Oregon (2%); San Diego, California (2%); South Bend, Indiana (2%); Columbus, Georgia (1%); Hampton, Virginia (1%); Manchester, Connecticut (1%); Cheshire, Connecticut (1%); Elmwood Park, New Jersey (1%); various locations within the continental U.S. (27%); and various locations outside the continental U.S. (7%), and is expected to be completed in September 2024. Fiscal 2022 aircraft procurement (Navy) funds in the amount of $533,202,564; fiscal 2022 aircraft procurement (Air Force) funds in the amount of $486,934,274; fiscal 2021 aircraft procurement (Air Force) funds in the amount of $499,194,377; fiscal 2021 aircraft procurement (Navy) funds in the amount of $379,564,738; fiscal 2022 research, development, test and evaluation (Air Force) funds in the amount of $5,355,067; fiscal 2022 research, development, test and evaluation (Navy) funds in the amount of $5,355,066; non-U.S. DOD participants funds in the amount of $636,195,308; and FMS customer funds in the amount of $355,166,432 will be obligated at time of award, none of which will expire at the end of the current fiscal year. The Naval Air Systems Command, Patuxent River, Maryland, is the contracting activity.