The 51st Operations Group (51 OG) is the operational flying component of the United States Air Force 51st Fighter Wing, stationed at Osan Air Base, South Korea.The group's World War II predecessor unit, the 51st Fighter Group. was activated in January 1941, nearly a year before American entered World War II. It was one of the first groups deployed from the United States after the Attack on Pearl Harbor, traveling west to India via Australia and Ceylon.