- 1969~1997 (Vietnam War)
- U.S.
- M551 Sheridan is AR/AAV (Armored Reconnaissance / Airborne Assault Vehicle)
- 51 Sheridans were deployed by the 82nd Airborne Division during Operations Desert Shield & Desert Storm 1991
- M551 - production model in 1967, active in Vietnam War
- M551A1 - upgraded M551 with AN/VVG-1 laser rangefinder
- M551A1 TTS - Tank Thermal Sight, fitted with the AN/VSG-2B thermal sight unit, similar to the unit used on the M60A3 tank
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