Title for a Movie about the life of college friends that called themselves the Fusiliers

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While in college in Atlanta in 1977, we watched a black and white movie about a group of guys that met in college. It spanned their whole lives, including going off to war. When they thought one of them was killed, another friend had a child with the missing friend’s wife–but then he returned. The whole movie the kid wants to find out who his real father is. At the end he asks the man that was his real father but the answer he gives is simply “What difference can it make now”.

I thought the name was “The Black Sedan” but I can’t find a movie with that tile.

They called themselves the Fusiliers and the group of guys watching that day–including yours truly–decided to do the same. We are friends to this day.

Can anyone help with the title of this movie?


Edited question