He fought in both the Korean and Vietnam Wars, serving in the 5th Special Forces Group in Vietnam, and is a Medal of Honor recipient. His rank is inconsistent: throughout the first four seasons, he is referred to as possessing the rank of lieutenant colonel, though in keeping with US Army practice, he is most often referred to simply as "Colonel". In the fourth-season episode "Members Only" and fifth-season episodes "Trial by Fire" and "Firing Line", however, he is wearing the eagle insignia of a full colonel. (His medals in these episodes are also different from those on display the last time he wore his Class A uniform in the first-season finale, "A Nice Place to Visit".) Hannibal's Social Security Number, revealed in the fifth-season episode "Dishpan Man", is 044-34-0681B. Thriving on adventure and the adrenaline rush of life-threatening situations (or being "on the jazz", as the rest of the team refers to it), he seems to genuinely enjoy every challenge they encounter. He is renowned by both allies and enemies for being cool-headed and extremely clever. There is rarely a situation where he is not able to smile in the face of adversity. He will usually light up a cigar when he needs to do some thinking—often when coming up with a plan, or in the heat of a dangerous or exciting moment. He is also often seen putting on his gloves when he senses the action is about to pick up (such as a fist fight breaking out). When captured by their enemies, he will deliver flippant or sarcastic remarks. He regularly dispenses aphorisms, especially to their foes, upon defeating them. He also has some medical skills which he picked up when in Vietnam.