That was largely a PR exercise. America didn’t actually need military aid from Europe and there wasn’t much in fact. The only ones who did much real fighting at all were the Brits and theirs was limited. The rest - like the Germans for example - had to be kept in quiet out of the way places where they wouldn’t see any actual combat. Firstly as their own parliamentary report said:
www.atlanticcouncil.org/blogs/new-atlanticist/german-soldiers-too-fat-and-drunk-to-fight/#:~:text=This%20has%20prompted%20Reinhold%20Robbe,crack%20commando%20squad%2C%20the%20KSK.
Secondly, their gear was crap and the rules of engagement imposed on them by their government meant they could only fire back if somebody was actually shooting at them first. In short, they were pretty much useless.