BTW, the movie is not kind to abusive behavior such as this. The officer in charge, contrary to common practice, stops the abuse of Japanese soldiers by their superiors and orders medical aid for a captured American despite supplies being short. He also opposed war with America, but had to do his duty. It helps that he was probably somewhat Westernized due to a partly Canadian education and a couple years of work and travel in the US.
I'm proud to say that my grandfather was a member of the "Jungleers," the 41st Sunset Division of the U.S. Army who helped liberate both New Guinea and the Phillipines.
He's gone now, but I've spent some time acquiring books written about the 41st, to learn as much as possible about these missions, since the Marines were involved in the higher profile WWII Pacific battles (Iwo Jima, Solomons, etc.).