Duke aka Conrad S. Hauser is one of main characters of G.I. Joe:Rise of Cobra. Duke was the callsign of G.I. Joe field commander, and Major Conrad S. Hauser. Duke was a brave and noble man who cared a great deal about his friends and tried to save Rex just before the bunker Rex was trapped inside was blown up. Four years later, he saved Ripcord during the battle over the case which contained the nanomite warheads.