(IATA: DNA, ICAO: RODN) is a United States Air Force base in the towns of Kadena and Chatan and the city of Okinawa, in Okinawa Prefecture, Japan. It is often referred to as the "Keystone of the Pacific" because of its highly strategic location. It is located just 650 km off the coast of China and at a distance of just 770 km from Shanghai, a major economic hub. It is home to the USAF's 18th Wing, the 353rd Special Operations Group, reconnaissance units, 1st Battalion, 1st Air Defense Artillery Regiment, and a variety of associated units. Over 20,000 American servicemembers, family members, and Japanese employees live or work at Kadena Air Base. It is the largest and most active U.S. Air Force base in East Asia. History Kadena Air Base's history dates back to just before the Battle of Okinawa in April 1945, when a local construction firm completed a small airfield named Yara Hikojo near the village of Kadena. The airfield, used by the Imperial Japanese Army Air Force, was one of the first targets of the Tenth United States Army 7th Infantry Division. The United States seized it from the Japanese during the battle. World War II What the Americans captured was a strip of badly-damaged coral runway. "The initial work at Kadena was accomplished by the 1901st Aviation Engineer Battalion 7th U.S. Infantry Division and Naval Construction Battalion Maintenance Unit CBMU 624 on 4 April", by nightfall the same day, the runway could accept emergency landings. Eight days later, and after some of coral were added, the airfield was declared operational and put into immediate service by artillery spotting aircraft. Additional construction was performed by the 807th Engineering Aviation Battalion to improve the airfield for USAAF fighter and bomber use with fuel tank farms, a new bituminous runway, and a runway for bomber aircraft, by August. Kadena airfield was initially under the control of Seventh Air Force, however on 16 July 1945, Headquarters Eighth Air Force was transferred, without personnel, equipment, or combat elements to the town of Sakugawa, near Kadena from RAF High Wycombe England. Upon reassignment, its headquarters element absorbed the command staff of the inactivated XX Bomber Command. Kadena was used by the headquarters staff for administrative flying requirements. Upon its reassignment to the Pacific Theater, Eighth Air Force was assigned to the U.S. Army Strategic Air Forces with a mission to train