It is interesting. I am very familiar with the contractors captured by the Japanese at Wake Island. The Japanese didn't follow the Geneva Convention at all, so their practices have little to teach us. By the way, the Terrorists don't follow it either, and pretending that following it protects our soldiers is a kind of insanity.
Note, the current version of Geneva Convention was adopted after WWII. The current version was modified in light of WWII experience to permit organizations like the French Resistance (Maquis) to follow the rules, and fight against an occupier in fair ways and gain some protection.
Again, the Terrorists don't follow it. They don't wear uniforms. When that happens, restrictions do not apply to only one side, do they?