Mustang Officer: (slang) A military officer who previously served in the military as an enlisted service member. Most often, Marine Mustang Officers are prior enlisted Marines who commissioned without a break in service. So, they went through OCS via the Marine Enlisted Commissioning Programs, instead of leaving service, going to college perhaps, and then rejoining. In fact, some enlisted Marines attend the Naval Academy while … Continue reading What’s a Marine Mustang Officer?