The Mark 21 nuclear bomb was a United States thermonuclear gravity bomb first produced in 1955. It was based on the TX 21 "Shrimp" prototype that had been detonated during the Castle Bravo test in March 1954.

Oct 31, 2023 · WASHINGTON — Lockheed Martin has been awarded nearly $1 billion to develop a new reentry vehicle for the LGM-35A Sentinel intercontinental ballistic missile (ICBM), the Pentagon announced Monday...

The Mk-21 reentry vehicle (RV) used with the W87 warhead was previously known as the ABRV, Advanced Ballistic Reentry Vehicle, designed by AVCO Systems Division. This RV affords the warhead greater accuracy.

The Mark 21 free-fall nuclear bomb was adopted in service in 1955. It was developed on the basis of the prototype TX-21 "Shrimp", which was tested in March 1954 (the Castle Bravo test).

Jun 18, 2024 · After attaining full operational capability, the Mk21A RV will be integrated on the nation’s intercontinental ballistic missile weapon system. The Mk21A program is currently in early development and overseen by the Air Force Nuclear Weapons Center.

Mark 21 or Mk XXI or variation, may refer to:

Jun 18, 2024 · Mk21A is the U.S. Air Force’s integrated reentry vehicle and the critical front-end of the service’s future intercontinental ballistic missile (ICBM) weapon system. This flight test from Vandenberg Space Force Base in California, tested Lockheed Martin’s Mk21A design components and technologies for the vehicle.

Apr 18, 2024 · The Mark 21 fuze, an integrated assembly of Sandia-designed logic and sensing devices directs the warhead to initiate firing sequences at the correct point in targeting parameters. The Mark 21 Fuze Replacement Program is a partnership between the NNSA and the U.S. Air Force.

Jun 19, 2024 · It will carry the future ICBM payload — the W87-1 nuclear warhead, an upgrade on the W87 carried by the operational Minuteman III ICBM Mk 21 reentry vehicle. Work is being performed in Pennsylvania and is expected to be completed by October 2026.

Oct 17, 2019 · The Air Force has awarded Lockheed Martin a $108 million contract for the Mk21A reentry vehicle -- a platform that's intended to deliver the W87-1 warhead from the Ground Based Strategic Deterrent system.