Semperfi71,
My dad was an Airedale in the Pacific during WW2 and mentioned going through a number of firearms before he found a combination he felt comfortable with. Started out with a M-1 Carbine but just didn't like it. Carried a Type 38 carbine for a while, and eventually traded into a 'civilian" version Thompson, with the vertical foregrip. The Thompson seemed too heavy for daily use and when the M-3 Grease Guns became available he carried that until the end of the war. Handgun wise he said he had both a 1911A1 and a S&W 38, but carried the 38 because he felt it shot better and was more compact.
The 1911 was sold late in the war to a Marine pilot who felt he was going to be involved personally in the invasion of Japan and wanted more firepower than his issued 38. The price was $100, a lot of money in 1945.
The Thompson almost came home with dad. He said he had it disassembled and packed in his sea bag. Then word got out that all bags would be searched before the men were allowed to board ship. Fearing repercussions he traded the Thompson for a Japanese sniper uniform at the last moment. Ironically at 6'2" dad was the tallest member of his unit, and at 23 was one of the oldest surviving enlisted men, so he was the one chosen to search the bags. I asked him if he confiscated much and he said the only thing he drew the line at was explosive ordinance. He was supposed to pull alcohol, pornography, firearms, ammunition, and body parts. But by that time he was so fed up with the military all he was concerned about was some idiot dropping a knee mortar round and killing him on his way home.