.45 ACP for close in fighting has to be preferable over 9mm parabellum.
Choose your platform but don’t tell me 9mm would be better or equal.
I am not an m16/5 fan but can see it’s benefits in 5.56 as far as carrying extra ammo over, say, 7.52x51…308. (Though I’ll take the latter when shooting into structures or cars).
If the little girls they allow in combat these days can’t handle .45 ACP, at least give them .40 S&W.
I’m not arguing for/against .45 &/or 9mm. I was trying to answer the question you asked about whether or not the Army had a bunch of Thompsons & M-3 Grease Guns stored somewhere. I think the M-3 Grease Guns were finally purged from the Army inventory, mainly in armor units, during the last 20 years.
“If the little girls they allow in combat these days can’t handle .45 ACP, at least give them .40 S&W.”
I prefer a 40 over a 45.
A 155gr Speer Gold Dot at 1250fps is preferred over a 230gr ball round at 950fps.