The M3 Submachine gun

The M3 Submachine Gun or "Grease Gun" was an American 45 caliber submachine gun which entered service in 1942 and in 1945, began replacing the Thompson Submachine Gun.

Usage by the MarinesEdit

The M3 is only seen being held by an Army Intelligence officer watching over 3 captured Japanese soldiers in Okinawa. It never makes an apperance again. Not seen in hands of any Marine in
M3 grease hun

A American soldier guards 3 Japanese POWs at Okinawa.

the series. In reality they were used by Marines, although just like guys in the Army, they much preferred the Thompson because it appeared much more reliable.


  • It is the least seen weapon in the series, and it has not been seen used by any of the major characters.