Sioux Gateway Airport , also known as Colonel Bud Day Field, is a public and military use airport in Woodbury County, Iowa, United States. It is located six nautical miles (7 mi, 11 km) south of the central business district of Sioux City, just west of Sergeant Bluff. On May 25, 2002, the airport was named in honor of United States Air Force Colonel George Everette "Bud" Day, a Sioux City, Iowa, native who is the only person ever awarded both the Medal of Honor and the Air Force Cross. The National Plan of Integrated Airport Systems for 2011–2015 categorized it as a primary commercial service airport since it has over 10,000 passenger boardings (enplanements) per year. As per the Federal Aviation Administration, this airport had 28,137 enplanements in calendar year 2011, an increase of 13.91% from 24,701 in 2010. The airport is home to the 185th Air Refueling Wing (185 ARW), an Air Mobility Command (AMC)-gained unit of the Iowa Air National Guard, flying the KC-135 Stratotanker, as well as Sioux City Air National Guard Base. The airport is owned and operated by the city of Sioux City and governed by a seven-member Airport Board of Trustees. Airport Board members are appointed by the City Council and serve four-year terms. History The construction of Sioux City Army Air Base began in March 1942, about three months after the Japanese attack on Pearl Harbor. Opened on July 5, 1942, it became a major training center during World War II for crewmen of B-24 Liberators and B-17 Flying Fortresses. With the end of World War II, the former training base switched to becoming a processing center to discharge personnel out of the service and back into civilian life. Sioux City Army Air Base closed in December 1945, but in September 1946, the airfield was opened by the Air Force Reserve. Sioux City Air Base was one of the first Air Force Reserve bases established after the war, and in December 1946, the 185th Iowa Air National Guard unit was established at Sioux City. Assigned to the new Air Defense Command (ADC) upon reactivation, the 140th Army Air Force Base Unit was activated as its host organization. The mission of the 140th AAFBU was to offer flight and ground training to all commissioned and enlisted members of the Air Force Reserve residing in Iowa, Minnesota, Nebraska, South Dakota and Wyoming. By the