On the back of the photo my uncle had written that the location was near Kunming hunting in the mountains in 1945.
They each carried a 1911 and knife, as always. Plus the Thompson, M1icon carbine, and the M1 Garand on the end. Their ride was a jeep with mounted M2.
They were pilots and not a strike force, but required protection. Probably more from bandits than Japs at this point.
My uncle suffered from stomach and intestinal problems all his life after China.