This Painting, Showing A USAF Squadrons Work A Day Flying World, Is An Allied Venture. The Field Is Royal Air Force (Raf) The Tower Operator Is From The Royal Air Force, And, Only The Squadron, Its Mechanics And Maintenance Men Pertinent To The Squadrons Mission Are Fro The USAF. The Mobile Tower Is Part Of A Technique For All Of The Squadrons (F-100s Airers And All Of Its Field Approach Techniques. On A Rotation Basis, One Pilot Mans The Unit And Directs All Planes In Approaches And Landings, And Grades Each Pilot In His Performance Of Them). Gca (Above) Ground Controlled Approach.