The 323d Expeditionary Operations Group is a provisional United States Air Force unit assigned to the United States Air Forces in Europe. As a provisional unit, it may be activated or inactivated at any time. The group was again active during the 1950s as the 323d Fighter-Bomber Group, flying North American F-86 Sabres and North American F-100 Super Sabres at Bunker Hill Air Force Base, Indiana. It remained inactive until 1991, when it became the 323d Operations Group at Mather Air Force Base, California, where it trained navigators until it was inactivated in 1993.