Short story collections about WW1, WW2, or Vietnam? (No YA)

Hey all, I’m looking for short story collections about WW1, WW2, or the Vietnam War. There are many great novels that revolve around these wars and their aftermath, but I am on the hunt specifically for short stories that address these subjects. Homefront fiction is fine as long as there is a clear tie-in. Any nationality is fine. I prefer authors who lived through the conflicts rather than ones writing historical fiction. No YA, please.