Life! Life is the main reason for living. Plod along, add some things that pique your interest and next thing you know, something unexpected happens. It's usually good but not always. Even life's unpleasantries can be interesting.

I'm not aware of a "squad"SMG. The BAR was the main issue automatic weapon. Thompsons were issued to commandos and paratroopers. Small, powerful, for troops that "assaulted enemy positions.

Thompson sub machine gun. 30 caliber carbine with selector switch. Early American assault rifles.

Apologize. Accept and learn. Savor the cringe and move on.