If you ever want to know more about the four Geneva Conventions, the International Committee of the Red Cross has a great overview. And if you need citations: (1) GC I: wounded and sick, 6 U.S.T. 3114; (2) GC II: shipwreck, 6 U.S.T. 3217; (3) GC III: POW, 6 U.S.T. 3316; (4) GC IV: civilians, 6 U.S.T. 3616.