This was taken in the Spring of 1968 at the Tay Ninh Army base in Vietnam. Camera was a 1968 Nikon F with the 105mm F2.5 lens. I digitized the negative just recently by using my Nikon Z6II and the Nikon F Bellows and slide copier, also from 1968. The photo was taken after this pilot came back from a mission and we were talking about the action he had just experienced. My title would be, "After Action Cigarette."
The only processing after the digitizing was a bit of a contrast increase. Cannot be sure, but film was probably Panatomic X or Plus x.