As of 1992, a United States Air Force fighting squadron is made up of 18 aircraft, although other types of squadrons exist and typically have at least 12 aircraft. A squadron is a group of aircraft that are usually used for combat purposes.
Before 1992, the United States Aircraft organized its fighting planes into squadrons of 24 aircraft each. However, the Air Force Chief of Staff mandated a change to this policy so that the squadrons would be smaller. This way, there would be more squadrons, making the Air Force more effective at responding to conflicts in different places. The change also made it easier for the squadron commander to direct the squadron personnel. F-15C squadrons, however, were changed back to 24 aircraft because this type of squadron was more effective with more aircraft.