The Sheridan was designed as a light support tank that had the firepower to destroy a main battle tank. It is one of the few tanks that can be airdropped from the back of a C-130 Hercules, and was the first United States vehicle to arrive in Saudi Arabia in the Gulf War. It is also a major failure, as far as its design is concerned. The Sheridan was equipped with a 152mm Shillelagh Missile System, a surface to surface defense system designed to kill tanks at long range, without having to endanger the Sheridan’s crew. The US completely overhauled these tanks in the last few years of the 20th Century, and the Shillelagh system works – nominally. Sheridan tanks were common on the home front, as they were regulated to National Guard duties after their relative failure on the battlefields of the Persian Gulf. In addition to the 152mm Shillelagh system, the Sheridan is armed with two MG3 machine guns, and takes 60 cells to fully recharge.
https://nationalinterest.org/blog/the-buzz/the-curious-case-the-us-armys-m551-sheridan-light-tank-19227