My Dad and uncles joined up because of Pearl Harbor. They were all in the Pacific. They all made it back home.
God Bless the Greatest Generation!
A friend of his in the Marines got a "Dear John" letter from his girlfriend so my father gave him his sister's address and they started corresponding--they later got married. They had 2 children and 7 grandchildren (I don't know how many great-grandchildren by now)--all people who would never have been born if not for that "Dear John" letter.