Seems like history has been re-written. I talked to lots of WWII vets, including my Dad and Uncles. Almost to a man, if they had an opinion, it was a negative one on the Carbine. Most liked the Thompson, with the caveat that it was heavy. Some liked the Grease Gun.

My Uncle carried one at D-Day and in the Belgium Bulge. He shot at some of our own men with it when they tried to hijack his truck presumably to sell on the Black Market.