 The Marine Corps used the backpack-type M2A1-7 flamethrower and M2-2 flamethrowers, also finding them useful in clearing Japanese trench and bunker complexes.The first known USMC use of the man portable flamethrower was against the formidable defenses at Tarawa in November 1943.The Marines pioneered the use of Ronson-equipped M-3 Stuart tanks in the Marianas.