The Naval Air Systems Command seeks a sole-source contractor for FY2027–FY2031 production of Combat Identification Systems, with an estimated contract value of $50–90 million. Performance will occur at the contractor’s U.S. facilities, with no government site work anticipated. The contract covers RT-2159/APX IFF Transponder production and related services, requiring a minimum output of 18 units per month. Interested firms must submit a capabilities statement by the response date, demonstrating experience with Mark XIIB IFF systems and access to necessary technical data. All responsible sources, including small businesses, are encouraged to respond.