Lockheed Martin Corp., Fort Worth, Texas, is awarded a $3,910,000,000 firm-fixed-price, fixed-price-incentive, cost-plus-incentive-fee, cost-plus-fixed-fee, indefinite-delivery/indefinite-quantity contract. This contract procures training system and simulation design, development, integration, test, production, deployment, modifications/upgrades, and sustainment in support of the F-35 Lightening II aircraft for the Air Force, Navy, Marine Corps, non-U.S Department of Defense Participants, and Foreign Military Sales countries. Work will be performed in Orlando, Florida (60%); Fort Worth, Texas (30%); and other various locations within and outside the continental U.S. (10%), and is expected to be completed by September 2028. No funds will be obligated at the time of award; funds will be obligated on individual orders as they are issued. This contract was procured on a sole source basis pursuant to 10 U.S. Code 2304 (c)(1). Naval Air Systems Command, Patuxent River, Maryland, is the contracting activity (N0001924D0110).