USERS (Unmanned Space Experiment Recovery System) was a Japanese microgravity experimental satellite. The 1.7-ton (with fuel), 700-W satellite consisted of a ReEntry Module (REM) and a Service Module (SEM) that was to provide power and a communications link to the REM. In turn, REM consisted of a ReEntry Vehicle (REV) and a Propulsion Module (PM). After 8.5 months in orbit, REM was to be separated to deorbit and the REV was to soft-land with its contents at 151E 22N in the Pacific near Japan's Ogasawara Islands. The SEM was to be elevated to a higher orbit.

The SEM had a mass of 800 kg; the REV/PM had a total mass of 926 kg

• 2002 September 10 - USERS - Launch Site: Tanegashima. Launch Complex: Y. Launch Vehicle: H-2. Mass: 1,726 kg (3,805 lb). Perigee: 497 km (308 mi). Apogee: 508 km (315 mi). Inclination: 30.40 deg. Period: 94.70 min.
  Launch delayed from August 2002. First operational flight of H-2A booster. USERS (Unmanned Space Experiment Recovery System) was a Japanese microgravity experimental satellite. After 8.5 months in orbit, a reentry vehicle was to be returned to earth with the materials manufacturered in space.