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393rd Bomb Squadron
393rd Bomb SquadronB-2 Spirit on approach for landing[note 1]
Active	1944–1990; 1993–present
Country	United States
Branch	United States Air Force
Role	Strategic Bombing
Part of	Air Force Global Strike Command
Engagements	Pacific Theater Vietnam War Kosovo War Globalwar on terrorism[1]
Decorations	Air Force Outstanding Unit Award withCombat "V" Device Air Force Meritorious Unit Award Air Force Outstanding Unit Award Republic of Vietnam Gallantry Cross with Palm[1]
Insignia
393rd Bomb Squadron emblem[note 2][1]
393rd Bombardment Squadron emblem[note 3][2][3]

The393rd Bomb Squadron^{[note 4]} is part of the509th Bomb Wing atWhiteman Air Force Base, Missouri. It operatesNorthrop Grumman B-2 Spirit nuclear-capable strategic bomber aircraft.

The squadron was first organized in March 1944 as the393rd Bombardment Squadron. In November 1944, the squadron transferred to the509th Composite Group and began training for the delivery ofnuclear weapons. In May 1945, it deployed to the Mariana Islands, where it became the only unit to usenuclear weapons incombat, when its aircraft dropped atomic bombs onHiroshima and Nagasaki on 6 August 1945 and 9 August 1945. AfterV-J Day, the squadron returned to the United States, and was stationed atRoswell Army Air Field, New Mexico.

During the early years of theCold War, the squadron was involved inOperation Crossroads, nuclear weapons testing onBikini Atoll, and has continued to operate nuclear-capable aircraft since then. At Roswell, the squadron upgraded toBoeing B-50 Superfortresses and later, to jet poweredBoeing B-47 Stratojets. WhenWalker Air Force Base closed in 1958, the squadron and its B-47s moved toPease Air Force Base, New Hampshire. At Pease, it replaced its B-47s withBoeing B-52 Stratofortresses in 1966, and in 1970, became one of only twowings inStrategic Air Command to equip with theGeneral Dynamics FB-111.

With the phaseout of the FB-111 and closure of Pease, the squadron moved as a paper unit toWhiteman Air Force Base, Missouri in 1990. In 1993, it began to receive Northrop Grumman B-2 Spirit stealth bombers and became operational as the only regular Air Force unit to operate these aircraft.

The 393rd Bomb Squadron was activated as aBoeing B-29 Superfortress squadron in early 1944; trained under theSecond Air Force. Due to a shortage of B-29s, the squadron was initially equipped with formerII Bomber CommandBoeing B-17 Flying Fortresses previously used for trainingheavy bomber replacement personnel as engineering flaws were being worked out of the B-29. The squadron was then reassigned for advanced training and received B-29s atFairmont Army Air Field, Nebraska during the late spring and summer of 1944.

In December 1944 reassigned as the only operational B-29 squadron tothe 509th Composite Group atWendover Field, Utah in December. Aircraft were refitted to theSilverplate configuration becoming atomic bomb capable under a highly classified program. They were then deployed toNorth 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 delivernuclear weapons incombat, as they dropped thefirst atomic bomb onHiroshima, Japan, on 6 August 1945, and thesecond atomic bomb onNagasaki, Japan, on 9 August 1945.

Reassigned to the United States in November 1945, it became part ofContinental Air Forces (later Strategic Air Command). The unit was deployed toKwajalein Atoll in 1946 to carry outOperation Crossroads which was a series of atomic bomb tests onBikini Atoll in July.

The squadron began upgrading to the newBoeing 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 nuclear deployment missions if necessary. The squadron deployed to SAC airfields in England, and toAndersen Air Force Base,Guam on long-term deployments in the 1950s.

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

The squadron was scheduled for inactivation; it instead receivedBoeing B-52D Stratofortresses in 1965. It rotated aircraft and crews to Andersen Air Force Base, Guam in support ofSoutheast AsiaOperation Arc Light operations between 1966 and 1969. The squadron was not operational from November 1969 to June 1971. Re-equipped withGeneral Dynamics FB-111 nuclear-capable medium bombers in 1970, the squadron operated until retirement in 1990.

It was reactivated in 1993 as the first operationalNorthrop 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.

• Constituted as the393d Bombardment Squadron, Very Heavy on 28 February 1944

Activated on 11 Mar 1944

Redesignated393d Bombardment Squadron, Medium on 2 July 1948

Redesignated393d Bombardment Squadron, Heavy on 2 April 1966

Redesignated393d Bombardment Squadron, Medium on 1 December 1969

Inactivated on 30 September 1990

• Redesignated393d Bomb Squadron on 12 March 1993

Activated on 27 August 1993^[1]

• 504th Bombardment Group, 11 March 1944
• Second Air Force, 25 November 1944
• 509th Composite Group (later 509th Bombardment Group), 17 December 1944 (attached to509th Bombardment Wing, 17 November 1947 – 14 Sept 1948 and after 1 February 1951)
• 509th Bombardment Wing, 16 June 1952 – 30 September 1990^{[note 5]}
• 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 Force Base), New Mexico, 6 November 1945

Deployed toBucholz Army Airfield,^{[citation needed]}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]

• Atomic bombings of Hiroshima and Nagasaki
• List of B-52 Units of the United States Air Force

Explanatory notes

Citations

 This article incorporatespublic domain material from the Air Force Historical Research Agency

• 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. Retrieved2 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. Archived fromthe original(PDF) on 20 December 2016. Retrieved17 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. Archived fromthe original(PDF) on 20 December 2016. Retrieved17 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. Retrieved17 December 2016.
• Watkins, Robert A. (2013).Insignia and Aircraft Markings of the U.S. Army Air Force In World War II. Vol. V, Pacific Theater of Operations. Atglen, PA: Shiffer Publishing, Ltd.ISBN 978-0-7643-4346-9.

• Military units and formations in Missouri
• Bombardment squadrons of the United States Air Force
• Military units and formations established in 1944

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