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The Mark 21 Mod 2 torpedo, was a passive acoustic homing variant of the Mark 13 torpedo. It used the widely used Mark 13 torpedo as a basis, with the addition of passive acoustic homing developed by Bell Labs .
[citation needed] The system is manually loaded and fired electrically, with firing linked to the trigger of the tank's main gun. The system is referred to as the "Simulator Tank Gunfire: Main Weapons Effect Signature" in US service, with the cartridges referred to as Simulator, Flash, Artillery M21.
Cases of documented injuries and accidents accompanied civilian M-80 use during the 1950s and 1960s, and still occur, as M-80s are still produced and sold to the public.