sentences:  He was sent to the pilot pool at the Aviation Concentration Center at Camp John Dick, Dallas, Texas; then assigned successively to the School of Aerial Observers, Post Field, Fort Sill, Oklahoma; the School of Aerial Gunnery, Taliaferro Field, Texas, graduating as a gunnery pilot of July 5, 1918; and in October, 1918 back to M.I.T.for a four-month course in aeronautical engineering.Upon completing his technical training in February 1919, Hegenberger became chief of the Instrument Branch at McCook Field, Dayton, Ohio.