I served in the Corps with some outstanding immigrants back in the 80's. Lots of good Filipino Corpsman (0bama corpseman) and some really outstanding Hispanic and Caribbean Marines. Samoans, Guamanians even an Iranian (he had a story) and a Jordanian (rich boy). More nationalities than I can remember. British, Canucks (threw him a party when he got his citizenship) and a Polish piece of $hit (hope he got deported back). Some were not so good but that is par for the course.
All that I can think of wanted to be AMERICANS with a citizenship. Even the Mexicans.