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Sierra Army Depot (SIAD) is a United States Army post and military equipment storage facility located near the unincorporated community of Herlong, California.It was built in 1942 as one of several ammunition storage facilities located far enough inland to be safe from Japanese attack, yet close enough to western military posts and ports to facilitate shipment of supplies. [2]
The M1 Abrams (/ ˈ eɪ b r ə m z /) [10] is a third-generation American main battle tank designed by Chrysler Defense (now General Dynamics Land Systems) and named for General Creighton Abrams. Conceived for modern armored ground warfare , it is one of the heaviest tanks in service at nearly 73.6 short tons (66.8 metric tons ).
Despite all these advances, the Abrams still retained the 4-man crew of the M60 tank as the autoloader was considered unproven and risky. Over 3,200 M1 Abrams were produced and first entered US Army service in 1980. About 6,000 upgraded M1A1 Abrams were produced and used a 120 mm smoothbore cannon, improved armor, and a CBRN protection system.
A number of considerations had led the U.S. Army and its contractors to favor the Army's standard M68 105 mm gun over Germany's 120 mm Rheinmetall Rh-120 smoothbore gun for the XM1 Abrams. To begin with, the 105 mm gun was "the smallest, lightest, and least costly gun adequate for the job."
[75] 3,273 M1 Abrams were produced 1979-85. [citation needed] An improved model called the IPM1 was produced briefly from October 1984 to May 1996 and contained small upgrades. [76] It was initially planned to retrofit the M1 and IPM1 with a longer barrel version of the 105 mm M68 gun.
Ukraine has sidelined U.S.-provided Abrams M1A1 battle tanks for now in its fight against Russia, in part because Russian drone warfare has made it too difficult for them to operate without ...
Bore evacuator on an M1 Abrams. The evacuator is a passive device generally consisting of a ring of holes drilled into the barrel, surrounded by a cylindrical pressure reservoir that is sealed to the barrel's surface. When the gun is fired, high pressure gas generated by the burning propellant pushes the projectile forward.
Systems that the ASM sought to replace included the M1 Abrams main battle tank, M109 howitzer and M2 Bradley infantry fighting vehicle. The Army spun out several of the systems— Advanced Field Artillery System , Line-of-Sight Anti-Tank and the Armored Gun System —after canceling the program, but all of these programs were eventually canceled.