As I believe you already found out, The sergeant in "Combat" carried a Thompson. The rest of the squad carried M-1 Garands and "Little John" carried a BAR[Browning Automatic Rifle].
No M-14's were used in the program. The major differences between the two rifles is the designers moved the gas system from the end of the barrel and added a box magazine to the M-14 which were major improvements.
Just to throw out a little confusion, the designation of M is just the first Military plan that was approved. The helmets, canteens and hate to tell you this, but the Thompson machine gun also was titled an M-1. Later there was an M1A1 Thompson.
Paratroopers, drivers, officers and support troops carried the M-1 Carbine. I found we produced more M-1 Carbines than any other weapon in history. My book that reports that is a little old and I'm sure by now, the M-16 had surpassed that.
I was aware Little John's weapon was a BAR. That looked pretty wicked. I was unaware of the other information. Thanks for the comments. This is what I like about the forum, there's always someone around who knows the answers to participant's questions.
Just watch out for your thumb. Deadly. :-D
Speaking of M-1 Carbines, my dad has a story. He was in Italy in WWII, participating in shooing the Germans out of a small town. He was in the combat engineers, so he had been issued the M-1 carbine.
He runs around the corner of a building, and literally bumps helmets with a German soldier. He swings up his carbine, goes to hit the safety, hits the clip release by mistake, and drops all his bullets in the street.
Fortunately Fritz had not waited around to see what was up and was making tracks for Heidelberg too fast to hear the pitter-patter of little fat cartridges.
But dad threw away the carbine, picked up a Garand from a dead GI, and carried it the rest of the war. He doesn't have anything nice to say about the carbine.
"But, daddy," the children cried, "Why did you have your safety on?"
"Didn't want to shoot myself in the foot," harrumphed Dad.