USA 405, also known by its alternative name USA 405, is an American satellite launched on September 6, 2024, from Space Launch Complex 4E at Vandenberg Air Force Base using a Falcon 9 launch vehicle. It belongs to the Starshield bus series and is owned by the National Reconnaissance Office (NROC). The spacecraft has dimensions of 0.3 meters in length, 4.1 meters in diameter, and an overall span of 29 meters. Its dry mass is 700 kilograms, with a launch mass of 750 kilograms. The satellite is powered by deployable solar arrays, though its precise mission remains unknown—it could be involved in imaging or signals intelligence (SIGINT). The manufacturer is SpaceX (SPXS), and the satellite was launched on the same date it became stable in orbit.