Castle Air Force Base (Castle AFB, 1941–1995) is a former United States Air Force Strategic Air Command base in California, located northeast of Atwater, northwest of Merced, and about south of Sacramento.
The Central Valley base in unincorporated Merced County was closed in 1995, pursuant to a Base Realignment and Closure Commission decision following the end of the Cold War and the disestablishment of Strategic Air Command (SAC). It is now known as the Castle Airport Aviation and Development Center.
History
The airfield was opened on 20 September 1941 as the Army Air Force Basic Flying School, one of the fields utilized to meet the needs of the 30,000 Pilot Training Program. It provided basic air training for beginning pilots and crewmen. Many pilots and crews were trained here during the war including a number of Women's Air Service Pilots (WASPs).
Auxiliary air fields used by Merced Army Air Field (as the site was known at the time) during the war were: Merced Municipal Airport Auxiliary Field No. 1 Ballico Auxiliary Field No. 2 Howard Auxiliary Field No. 3 Athlone Auxiliary Field No. 4 Potter Auxiliary Field No. 5 Merced New Municipal Airport Auxiliary Field No. 6 Mariposa Auxiliary Field
Postwar years
With the end of the war 444th Bombardment Group (Very Heavy) arrived on 15 November 1945 from West Field, Tinian with four squadrons (344th, 676th, 677th, and 678th) of wartime B-29s. The 444th operated from Merced for about six months with the 678th BS being re-designated as the 10th Recon Squadron and its aircraft being converted to the RB-29 configuration.
The three B-29 squadrons inactivated at Atwater on 6 May 1946 with the 10th Reconnaissance Squadron relocating to Davis-Monthan Field, Arizona where it turned in its RB-29 aircraft. The 444th was inactivated on 16 November 1947.
During the summer of 1945, when most other air fields were winding down, Merced was expanded to accommodate the large air tankers then programmed to come into service. After the war ended, Merced was home to several air tanker squadrons and remained a training center for pilots and air crews.
93d Bombardment Wing
Merced Army Air Field became Castle Field on 17 January 1946, named for Brigadier General Frederick Castle. On Christmas Eve 1944, Castle remained at the controls of his burning B-17 Flying Fortress over Europe while his crew bailed out, then was killed when the aircraft exploded; he was posthumously awarded the Medal of Honor.
The 93d Bombardment Group (Very Heavy) was activated at Merced on 21 June 1946, starting a nearly 50-year relationship with the airfield. The 93rd was a former Eighth Air Force B-24 Liberator group which was assigned to Merced for Boeing B-29 Superfortress training. The 93rd was one of SAC's first ten bomb groups. There were three initial operational squadrons (328th, 329th, and 330th) which absorbed the equipment and aircraft of the inactivated 444th BG.
On 1 October 1946, the base was put on "minimal operations on caretaker status," with control of the facility under the Colorado Springs AAF. The 93rd Bomb Group, however remained active. It, along with the 509th Composite Group at Roswell Army Air Field, New Mexico, was all there was of Strategic Air Command at that time. The base remained in this status until 1 May 1947 when it was reactivated.
On 1 May 1947, Castle Field was reactivated under Strategic Air Command. On 28 July 1947, the 93rd Bombardment Wing, (Very Heavy) was established and took over responsibility from the group. During 1947–1948, it flew Boeing B-29 Superfortresses, but soon received the upgraded version of the B-29, the Boeing B-50 Superfortress. In 1948, the entire wing deployed to Kadena AB, Okinawa, becoming the first Strategic Air Command bomb group to deploy in full strength to the Far East.
Castle Field was renamed Castle Air Force Base on 13 January 1948, this following the establishment of the USAF as a separate military service in September 1947.
On 27 June 1949, the Air Force Reserve's 447th Bombardment Group was activated at Castle and equipped with the B-29s formerly of the 93d Bomb Wing. The 447th remained active until 16 June 1951 when the group was activated and the aircraft and personnel sent to Far East Air Forces as replacements for combat losses during the Korean War. With the unit's departure, the 447th was inactivated.
The Convair B-36 Peacemaker entered SAC's inventory in 1948. The huge plane dwarfed earlier bombers and the 93rd, along with all other B-29 and B-50 bomb groups, was redesignated as "Medium." Only the B-36 groups were "Heavy."