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The Mk 21 Y1 had a yield of 18 to 19 megatons. The "clean" Mk 21 Y2 (later designated Mk 26) was tested at 4.5 megatons. All 275 Mk 21 weapons stockpiled were the Y1 version. [2] [3] Quantity production of the Mk 21 started in December 1955 and ran until July 1956. Starting in June 1957 all Mk 21 bombs were converted to the more advanced Mk 36 ...
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 ...
5"/38 MK 30, a variant of the 5-inch/38-caliber gun; Beaufighter Mark 21, a variant of the Bristol Beaufighter; Mk 21 (type 356), a variant of the Supermarine Spitfire (Griffon-powered variants) Freighter Mk 21, a variant of the Bristol Freighter; Mk 21 Mod 0, a 7.62×51mm variant of the M1919 Browning machine gun; Mk. 21 aircraft interception ...
Exploded diagram of the Mk21 reentry vehicle for the W87 [clarification needed]. 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.
Mark XX was given to the original Mk IV Griffon engine prototype DP845 to avoid confusion with the retitled Spitfire PR Mk IVs. The second Mk XX, DP851, initially had a Griffon II engine and made its first flight in August 1942. In December, it was refitted with a Griffon 61 and re-designated as a Mk 21 initial prototype.
The Precision Sniper Rifle (PSR) was a program by United States Special Operations Command to replace all bolt-action sniper rifles in use by United States special operations snipers with a single bolt-action rifle chambered for a large caliber Magnum round such as .300 Win Mag and .338 Lapua Magnum.
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M1919 Family (including Mk 21 Mod 0/1) (Medium Machine Gun, .30-06 Springfield and 7.62×51mm NATO) Colt–Browning M1895/1917; Heavy machine guns.