Science Applications International Corp., Chambersburg, Pennsylvania, was awarded a single award, indefinite-delivery/indefinite-quantity, firm-fixed-price contract (HC1084-23-D-0002) for Unisys Operating System 2200 capacity services with a contract ceiling of $50,213,909. Performance will be at current Defense Information Systems Agency data centers. The solicitation was issued as an other than full and open competition action pursuant to the authority of 10 U.S. Code§3304(a)(1) and Federal Acquisition Regulation 6.302-1, only one responsible source and no other supplies or services will satisfy agency requirements. Proposals were solicited via the SAM.gov website and one proposal was received. The period of performance for the contract consists of an 11-month base period, Dec. 20, 2022, through Nov. 30, 2023, and two one-year option periods through Nov. 30, 2025. The contracting activity is Defense Information Technology Contracting Organization, Scott Air Force Base, Illinois.