Duke is the code name of First Sergeant Conrad S. Hauser. He is field commander and second-in-command of the G.I. Joe Team after Hawk. He is one of the key characters of G.I. Joe and a fan-favorite. He is generally regarded by fans as a main character, despite not appearing in the comic series for a number of issues, nor was he one of the very first wave of original toys.
Much better poster than the bluish version they released earlier, but it still looks kind of cheap…