|For alternate versions of Michael Duffy, see Michael Duffy's Character Hub|
Sergeant Michael Joseph Duffy was Steve Rogers' drill sergeant while in basic training.
After 17 years of training new recruits at Camp Lehigh, in 1943, Sergeant Michael Duffy was assigned by Chester Phillips to instruct the candidates of Project Rebirth. One of the exercises that he gave was for the candidates to retrieve a flag on a wet, slippery flagpole, where the prize would be to ride back to camp with Peggy Carter after a grueling run. As the candidates swarmed the pole, Duffy cheered for Gilmore Hodge to reach the goal, as Steve Rogers watched and regained his composure. When the others failed and tired, Rogers disconnected the pin holding the pole, retrieved the flag and handed it to Duffy as he got into Carter's jeep.
Sometime later, while Duffy continued to train the candidates, Phillips threw a fake grenade among them. After Rogers made a possible self-sacrificing move by covering the grenade, Duffy ordered him to get up when it was learned that it was a dud.
- United States Army
- Strategic Scientific Reserve
- Comic books were created depicting fictional adventures of Captain America and a fictional version of Sergeant Duffy was created as well.