393rd Bomb Squadron

In December 1944 reassigned as the only operational B-29 squadron to 509th Composite Group at Wendover Field, Utah in December. Aircraft were refitted to Silverplate configuration becoming atomic bomb capable under a highly classified program. Deployed to North Field (Tinian) in late May 1945, flying non-combat missions practicing atomic bomb delivery techniques. The squadron was the only unit in the world to ever carry out and deliver nuclear weapons in combat, which dropped the first atomic bomb on Hiroshima, Japan, on 6 August 1945, and the second atomic bomb on Nagasaki, Japan, on 9 August 1945.

Reassigned to the United States in November 1945, it became part of Continental Air Forces (later Strategic Air Command). The unit was deployed to Kwajalein Atoll in 1946 to carry out Operation Crossroads atomic bomb tests on Bikini Atoll in July.

Began upgrading to the new Boeing B-50 Superfortress, an advanced version of the B-29 in 1949. The B-50 gave the unit the capability to carry heavy loads of conventional weapons faster and farther as well as being designed for atomic bomb missions if necessary. Squadron deployed to SAC airfields in England, and also to Andersen Air Force Base, Guam on long-term deployments in the 1950s.

By 1951, the emergence of the Soviet Mikoyan-Gurevich MiG-15 interceptor in the skies of North Korea signaled the end of the propeller-driven B-50 as a first-line strategic bomber. Received new, swept wing Boeing B-47 Stratojets in 1955 which were designed to carry nuclear weapons and to penetrate Soviet air defenses with its high operational ceiling and near supersonic speed. The squadron flew the B-47 for about a decade when by the mid-1960s it had become obsolescent and vulnerable to new Soviet air defenses. The squadron began to send its stratojets to AMARC at Davis-Monthan Air Force Base, Arizona for retirement in 1965.

Was scheduled for inactivation however instead received Boeing B-52D Stratofortresses in 1965. It rotated aircraft and crews to Andersen Air Force Base, Guam in support of Southeast Asia Operation Arc Light operations between 1966 and 1969. Not operational, Nov 1969–Jun 1971. Re-equipped with General Dynamics FB-111 nuclear capable medium bomber in 1970; operated until retirement in 1990.

It was reactivated in 1993 as first operational Northrop Grumman B-2 Spirit stealth bomber squadron.

• Combat operations: Combat in Western Pacific, 1 Jul – 14 Aug 1945. Only squadron trained for atomic warfare in World War II. Participated in atomic bomb tests on Bikini Atoll, Jul 1946, while deployed on Kwajalein. Rotated aircraft and crews to Andersen AFB, Guam, in support of Southeast Asia Operations, 1966–1969.
• Campaigns: World War II: Air Offensive, Japan; Eastern Mandates; Western Pacific. Vietnam War; Global War on Terror.
• Decorations: Air Force Outstanding Unit Awards: Apr – 1 Oct 1968; 1 Jul 1977 – 30 Jun 1979; 1 Jul 1981 – 30 Jun 1982; 1 Jul 1982 – 30 Jun 1984; 1 Jul 1988 – 30 Jun 1990. Republic of Vietnam Gallantry Cross with Palm: 5 Mar – 14 Oct 1969.

• 504th Bombardment Group, 11 March 1944
• Second Air Force, 25 November 1944
• 509th Composite Group (later 509th Bombardment Group), 17 December 1944 (attached to 509th Bombardment Wing, 17 November 1947 – 14 Sept 1948 and after 1 February 1951)
• 509th Bombardment Wing, 16 June 1952 – 30 September 1990[note 2]
• 509th Operations Group, 27 Aug 1993– present[1]

• Dalhart Army Air Field, Texas, 11 March 1944
• Fairmont Army Air Field, Nebraska, 12 March 1944
• Wendover Field, Utah, 14 September 1944 – 26 April 1945
• North Field, Tinian, 30 May–17 October 1945
• Roswell Army Air Field (later Walker Air Forcee Base), New Mexico, 6 November 1945

Deployed to Bucholz Army Airfield, Kwajalein, Marshall Islands, 1 May–July 1946; RAF Mildenhall, England, 4 June–2 September 1952; Andersen Air Force Base, Guam, 18 June–c. 18 September 1953 and 10 July–8 October 1954; RAF Upper Heyford, England, 26 January–30 April 1956

• Pease Air Force Base, New Hampshire, 1 July 1958 – 30 September 1990
• Whiteman Air Force Base, Missouri, 27 August 1993 – present[1]

Explanatory notes

Citations

 This article incorporates public domain material from the Air Force Historical Research Agency website http://www.afhra.af.mil/.

• Endicott, Judy G. (1998). Active Air Force Wings as of 1 October 1995 and USAF Active Flying, Space, and Missile Squadrons as of 1 October 1995 (PDF). Air Force History and Museums Program. Washington, DC: Office of Air Force History. ASIN B000113MB2. Retrieved 2 July 2014.
• Maurer, Maurer, ed. (1983) [1961]. Air Force Combat Units of World War II (PDF) (reprint ed.). Washington, DC: Office of Air Force History. ISBN 0-912799-02-1. LCCN 61060979. Retrieved 17 December 2016.
• Maurer, Maurer, ed. (1982) [1969]. Combat Squadrons of the Air Force, World War II (PDF) (reprint ed.). Washington, DC: Office of Air Force History. ISBN 0-405-12194-6. LCCN 70605402. OCLC 72556. Retrieved 17 December 2016.
• Ravenstein, Charles A. (1984). Air Force Combat Wings, Lineage & Honors Histories 1947-1977. Washington, DC: Office of Air Force History. ISBN 0-912799-12-9. Retrieved 17 December 2016.
• Watkins, Robert A. (2013). Insignia and Aircraft Markings of the U.S. Army Air Force In World War II. Volume V, Pacific Theater of Operations. Atglen,PA: Shiffer Publishing, Ltd. ISBN 978-0-7643-4346-9.