GI Joe Duke T ShirtShow you're a leader when you wear this cool G.I. Joe t shirt that doubles as a costume for Duke, the second-in-command in the G.I. Joe: A Real American Hero saga! The GI Joe Duke T Shirt is brown, and the front is covered with the dress and military gear of the languages specialist Sgt. Conrad Hauser, also known as Duke, including an ammo belt and a bandolier.