 His next assignment was in the newly activated 4750th Training Wing (Air Defense) at Yuma (later Vincent) Air Force Base, Arizona, an Air Defense Command organization developing tactics and training pilots to fly the F-86D rocket-firing interceptor.There he worked in conjunction with wing commander Col. Glenn Eagleston and 4750th Training Squadron commander Lt. Col. James Jabara, both aces who also served in the 4th FIW in Korea.Garrison attended the Marine Corps Amphibious Warfare Senior Officers Course (now the Marine Corps Command and Staff College) at Marine Corps Base Quantico from September 1957 to June 1958, then served a tour at Headquarters USAF in the Pentagon.