Question: In which county was the airbase where the 82d Training Wing was stationed ?
Context: The 82d Operations Group (82 OG) is an inactive United States Air Force unit.  It was last assigned to the 82d Training Wing, stationed at Williams Air Force Base, Arizona.  It was inactivated on 31 March 1993. The 75th Flying Training Wing was a flying training wing of the United States Army Air Forces.  At the time, a wing controlled several multi-squadron groups.  It was last assigned to the Army Air Forces Flying Training Command, and was disbanded on 15 June 1946 at Buckingham Army Airfield, Florida. Williams Air Force Base is a former United States Air Force (USAF) base, located in Maricopa County, Arizona east of Chandler, and about 30 mi southeast of Phoenix.  The area has since been annexed by the city of Mesa.  It is a designated Superfund site due to a number of soil and groundwater contaminants. The 81st Training Wing is a wing of the United States Air Force and the host wing at Keesler Air Force Base, Mississippi.  The 81st Training Wing has the Air Force’s largest Technical Training Group and trains more than 40,000 students annually.  Training includes weather, basic electronics, communications electronic systems, communications computer systems, air traffic control, airfield management, command post, air weapons control, precision measurement, education and training, financial management and comptroller, information management, manpower and personnel, radar, ground radio, and network control. The 34th Training Wing is a wing of the United States Air Force based at the Air Force Academy in Colorado Springs, Colorado.  The commander of the 34th Training Wing is "dual-hatted" as the Commandant of Cadets at the Academy. The 47th Flying Training Wing is a United States Air Force pilot training wing based at Laughlin Air Force Base, near Del Rio, Texas.  It is one of five pilot training units in the Air Force's Air Education and Training Command which conducts joint specialized undergraduate pilot training for the United States Air Force, Air Force Reserve, Air National Guard and allied nation air forces utilizing the T-38C, T-6A and T-1A aircraft. The 30th Flying Training Wing was a training wing of the United States Army Air Forces.  It was last assigned to the Flying Division, Air Training Command, and was disbanded on 13 October 1946 at Randolph Field, Texas. The 82d Training Wing (82 TRW) is a United States Air Force unit assigned to the Air Education and Training Command , Second Air Force.  It is stationed at Sheppard Air Force Base, Texas where it also is the host unit. Air Force Training Group is the Royal Australian Air Force (RAAF) group responsible for training personnel.  It is headquartered at RAAF Williams, Victoria.  The group was established as Training Command in 1953.  It formed part of Support Command between from 1959 to 1990, when it was re-established as Training Command.  In July 2006, Training Command was re-formed as Air Force Training Group under Air Command.  Air Force Training Group units are organised into Air Training Wing, Ground Training Wing, Reserve Training Wing, and RAAF College. The 37th Training Wing is a unit of the United States Air Force assigned to the 2nd Air Force and the Air Education and Training Command.  As the host unit to Lackland Air Force Base, Joint Base San Antonio, Texas, the 37th TRW is the predominate unit on the installation and is the largest training wing in the USAF.  Known as the "Gateway to the Air Force", the 37th Training Wing's replaced the Lackland Training Center as the single basic military training for the USAF.
Answer: Maricopa County,