The Department of Defense, specifically the Department of the Air Force, is soliciting proposals for the Global Positioning System (GPS) Engineering, Analysis, and Remote Site Sustainment III (GEARSS III) contract. This procurement aims to secure engineering research and development services, with a focus on sustaining GPS operations at various military installations, including Schriever Space Force Base and Vandenberg Space Force Base, among others. The contract is set aside for small businesses and includes a total of 17 attachments detailing the requirements and proposal submission guidelines. Proposals are due by May 12, 2025, and interested parties should contact Matthew Buchanan at matthew.buchanan@spaceforce.mil or Christopher Cook at christopher.cook.62@spaceforce.mil for further information and access to the Bidder’s Library.