The M551 Sheridan was designed as an air-transportable, amphibious armored reconnaissance and assault vehicle.
The M551 Sheridan was the U.S. Army's late-Cold-War attempt to field a lightweight armored vehicle that could be air-delivered and swim. The Army Historical Foundation calls it the Army's last attempt to produce an effective light tank, while the Collings Foundation highlights its aluminum armor and airborne/amphibious design goals.
The Sheridan combined light weight with a large 152 mm gun-launcher capable of firing Shillelagh missiles.
The vehicle's defining feature was the M81 gun-launcher system, which fired conventional ammunition and MGM-51 Shillelagh missiles. That gave the Sheridan ambitious firepower for its weight class, but it also added reliability and ammunition challenges. The aluminum hull improved mobility and deployability but limited protection.
The M551 saw combat in Vietnam and later remained important for airborne units and training use.
The Sheridan's service history was mixed. It gave airborne and cavalry units a deployable armored gun platform, but combat experience exposed protection and reliability weaknesses. After broader retirement, it remained useful in specialized roles such as the 82nd Airborne and training opposition-force vehicles, making it more influential than its troubled reputation suggests.
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