McPeak pushed through major organizational changes in the Air Force aimed at streamlining and emphasizing operations and combat readiness. Much of his tenure focused on elevating the status of flight operations, especially single-seat fighter pilots, some say at the expense of multi-seat fighter, bomber and reconnaissance aircraft and personnel, cargo and air refueling aircraft and personnel, and non-flying career fields. He also created the Air Force Expeditionary Wing concept, a fusion of combat forces and support into a single organization. He also transferred several flying wing and space wing command billets to brigadier generals, even though previously these had been commanded by colonels.