HEAVY DUTY. The code name used by U.S. Army Sergeant Lamont A. Morris. Growing up in Chicago, Heavy Duty surprised his parents when he developed a love of classical music. He even became an accomplished classical guitarist. When he enlisted at age eighteen, Heavy Duty became skilled at operating the Man-Portable Heavy Weapons System, finding it required the same skills as playing the guitar: left hand/right hand coordination and the ability to concentrate on simultaneous multiple tasks. Heavy Duty eventually became a member of the G.I. Joe team, serving with the team in the final years before its shutdown in 1994. Among his many missions, he helped defend the Pit in Utah from a surprise invasion by Cobra Commander and his troops. After the team was disbanded, Heavy Duty returned home to Chicago where he opened a small in-home recording studio. When the Joe team was reinstated in 2001, Heavy Duty rejoined the team, and fought a highly-advanced Cobra BAT in the streets of his hometown, Chicago. He was later one of the many Joes involved in an invasion of Cobra Island to battle the forces of a revived Serpentor.