Actual photo history: This story is kind of cool, basically he rescues a pilot from drowning, then gets back to man his station as machine gunner without bothering to dress and then thr plane takes off all while under fire.

Read the details here: https://rarehistoricalphotos.com/naked-gunner-rescue-rabaul-1944/

I find it kinda funny how there's a "This is the enemy" sign. It sounds like it's part of a tutorial.