The following guns were used in the film The Dirty Dozen:
As I add screencaps, I ask anyone who knows the characters please help me since I've seen the movie twice and even made a name list and descriptions but still can't figure out all their names. Thanks. - Gunmaster45
The most commonly seen gun in the film is the older M3 "Grease Gun". It is not an M3A1 model because the guns clearly hav external charging handles on the right side while the M3A1 as divots in the bolt so the bolt can be pinched and pulled back. They also have a much higher rate of fire than the M3A1 model. Prison Military and Police (M&P) guards are seen using them, as well as practically every member of the Dirty Dozen, most notabley Major Reisman (Lee Marvin) during several scenes in basic training. In reality, the Grease Gun was never fielded in such great numbers but was likley the easiest gun for the film armorers to aquire.
M1 Garand
While the M1 Garand was the most heavily fielded weapon of the U.S. Military during WWII, it is seen somewhat scarcely in the film, mainly in the hands of M&Ps and some of the members of the Dirty Dozen during the war games.
M1 Carbine
Several of Col. Breed's (Robert Ryan) men are seen armed with M1 Carbines, although they are only in the background.
When Reisman's men dissarm Breed's men, one of them is seen armed with a paratrooper folding stock M1A1 Carbine.
M1911A1
Several M&P officers and Major Reisman (Lee Marvin) are seen with M1911A1 pistols as their sidearms.