FOXHOLE #4 - 1955. Man is that intense. I feel like I should make an Apokolips Now joke, though
BOY COMMANDOS #13 - 1945. Nothing like some patriotic propaganda. Of course, the boys would be coming home for stateside adventures soon.
SGT. FURY #25 - 1965. Last cover Kirby did for the book, though by this time he was drawing an older Nick over in STRANGE TALES