Point taken.
In Vietnam I wasn't Infantry but we would have the M-79 40mm grenade launcher for perimeter guard duty.
IIRC, we had HE, flare, WP (white phosphorous) and double-ought buckshot rounds at our disposal.
A fun weapon to fire.
I was a 12 bravo, we had a couple of 203’s per squad. I only fired one once. It had a pretty good kick. Peace time army.