The USA 300 satellite, also known by its OBJECT_ID 2020-029B and NORAD_CAT_ID 45610, is an experimental spacecraft launched on May 17, 2020, from the AFETR SLC41 launch pad using an Atlas V 501 vehicle. It was built by UNKUS for USAFA (United States Air Force Academy) and has a bus configuration of ESPASat. The satellite measures 1 meter in length with a diameter of 0.6 meters, weighing 140 kg at launch and also dry mass. Its payload is listed as an "Unknown DoD Sat." It carries equipment including MEP, MMA, CANOE, ACES, and SkyPad, powered by solar cells and batteries. USA 300's motor type is the Magnetogradient Electrostatic Plasma Truster. The satellite achieved stability on May 28, 2020. Its purpose remains experimental in nature.