My grandfather was one generation removed from germany and served in europe.
The German americans that came to this country and served in the military had one major thing going for them. They chose to come to this country and become AMERICANS 100%. they assimilated. They learned english, they embraced democracy and capitalism, they hated hitler.
My grandparents came here from austria. It was NOT easy to become a citizen. They refused to let their children speak german.
They were americanized FIRST generation. Their allegiance was NEVER in question.