>>I thought the M3 submachine gun was dubbed grease gun . Not the Thompson.
You are correct.
Dad was a tank platoon commander back in the mid-1950s, and had to qualify with the M3. He loved those things.
Me too. Except that it was a bit difficult to retract the bolt on the simplified later version M3A1 when wearing gloves. That was a problem during my first hitch, as a young tank crewman in Germany, less so my second time out of the cage during my tour of the spas and cathouses of Southeast asia.
The only real problem I had with the things was that the GI issue 3-cell magazine pouches were in short supply. In germany we used an *engineers bag* pouch with eight mags to cure that problem. After I found out how much ammo I could go through when I missed a lot, I started carrying 15 magazines in a GO *buttpack* on a wide strap sling over my other shoulder.