Credits:

Sept. 15, 1970 A victim of American bombing, ethnic Cambodian guerrilla Danh Son Huol is carried to an improvised operating room in a mangrove swamp on the Ca Mau Peninsula. This scene was an actual medical situation, not a publicity setup. The photographer, however, considered the image unexceptional and never printed it. IMAGE: VO ANH KHANH/ANOTHER VIETNAM/NATIONAL GEOGRAPHIC BOOKS

I cannot imagine that guy had great chances of survival. Any swamp water in his wounds would likely cause a serious infection.

Better than nothing I guess

If the context was not provided, I’d assume this is some kind of art performance. Or a scene from some kind of movie.