sentences:  He remained at Davis-Monthan as an F-4 instructor pilot and served as Executive Officer of the 4453rd Combat Crew Training Wing until December 1968, when he joined the 366th Tactical Fighter Wing at Da Nang Air Base in the Republic of Vietnam.En route to Southeast Asia, he completed the U.S. Air Force Fighter Weapons Instructor Course (with Flying Award) at Nellis Air Force Base.While at Da Nang, Kelley completed 119 combat missions in F-4Es before being assigned, in November 1969, as Executive Officer of the Tactical Air Control Center Headquarters, Seventh Air Force, at Tan Son Nhut Air Base in the Republic of Vietnam.