In the United States Air Force, a wing is a larger unit that is normally subordinate to a Numbered Air Force. Most USAF wings are commanded by a Colonel, but some are commanded by Brigadier Generals. USAF wings structured to fulfill a mission from a specific base, and contain a headquarters and four groups: an operations group, a maintenance group, a medical group and a mission support group. Such a wing is referred to as a Combat Wing Organization. The 144th Fighter Wing is subordinate to the 1st Air Force and is comprised of the following Groups.