In the end however, these qualities could not compensate for its very thin aluminum armor. The Sheridan was used during the Vietnam War and it did achieve certain level of success, but it was extremely vulnerable to RPG hits and mine detonations. On the other hand, it could also get to...
The M551 "Sheridan" AR/AAV was a light tank developed by the U.S. and named after American Civil War hero General Philip Sheridan. It was designed to be air-dropped and amphibious. It was equipped with the innovative but problematic 152 mm M81