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.

2023年10月31日 · 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 MSR initially won the PSR competition, and was called the Remington Mk 21 Precision Sniper Rifle in U.S. military service. [3] [4] However, it was then decided that the Mk 21 did not conform to SOCOM requirements at the time in 2018, and the program was re-competed with the Barrett MRAD selected in 2019 as the Mk 22 Advanced Sniper Rifle ...

The W87 is an American thermonuclear missile warhead formerly deployed on the LGM-118A Peacekeeper ("MX") ICBM. 50 MX missiles were built, each carrying up to 10 W87 warheads in multiple independently targetable reentry vehicles (MIRV), and were deployed from 1986 to 2005.

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).

2024年4月18日 · 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.

2024年6月19日 · 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.

2017年4月11日 · The Remington MSR won the Precision Sniper Rifle competition and became the Mark 21 sniper rifle that was adopted by the US Special Forces as well as special forces units in Brazil and Columbia. Special thanks to all of those that helped make the review of …

2019年10月17日 · 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.