The M72A2 is an American LAW, lightweight, shoulder launched, self-contained anti-tank weapon consisting of a rocket packed in a launcher. It has a calibre of 66 mm and an effective range of 300 meters, penetrating 305 mm of steel plate. The original M72 LAW was found in Vietnam to have an unreliable electronic firing mechanism which was susceptible to the damp of a humid, jungle environment. Research M72A2