The United States M60A2 "Starship" tank.
This tank was based on an M60 series hull and a modified turret that could fire 152mm tank rounds or a Shillelagh missiles.
Ultimately it was a failure because the space age style turret was plagued with issues. Mostly electronic issues, but the shell casing system was also prone to catastrophic detonations.
The program was cancelled in 1971.


The M60A2 "Starship".

M60A2s near the Fulda Gap in Germany.

M60A2 unloading from an amphibious transport.