Firepower
Firepower is a strategic military tank action game developed by Silent Software, Inc. originally for the Amiga. It was released in 1987 and published by MicroIllusions and Activision. Ports were made for the DOS, Atari ST and Commodore 64 systems in 1988.
Gameplay consists of controlling a tank moving through enemy territory. The objective is to capture the flag inside the enemy base, blasting through walls and rescuing prisoners of war. Three different tanks were available - one was fast and fragile, one was slow but powerful, and the third was rated in between the two. You could swap tanks at any time by re-entering your garage at your home base.