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The M103 heavy tank (officially designated 120mm gun combat tank M103, initially T43) [3] was a heavy tank that served in the United States Army and the United States Marine Corps during the Cold War. Introduced in 1957, it served until 1974, by which time evolution of the concept of a main battle tank considered heavy tanks obsolete.
This is a list of United States Army fire control, and sighting material by supply catalog designation, or Standard Nomenclature List (SNL) group "F".The United States Army Ordnance Corps Supply Catalog used an alpha-numeric nomenclature system from about the mid-1920s to about 1958.
The development of the M60A2 with a new turret fitted with a 152mm gun was stopped and in 1978, work began on the M60A3 variant. It featured a number of technological enhancements, including smoke dischargers, a new rangefinder, and M21 ballistic computer, and a turret stabilization system. In addition, it reverted to the M68A1 105 mm cannon.
The M21 FCS for the M60A3 was made up of a Raytheon AN/WG-2 flash-lamp pumped ruby-laser based range finder, accurate up to 5000 meters for both the commander and gunner, a solid-state M21E1 gun data computer incorporating a muzzle reference sensor and crosswind sensor, ammunition selection, range correction and superelevation correction were ...
For non-sequential numbers, like M1 Abrams, see bottom of list. M1 combat car, also known as the M1 light tank; M1 light motorcycle; M2 light tank, .5" MG or 37 mm gun, 11-ton
Early in World War II, the range to the target was measured by optical rangefinders. Though some night operations were conducted using searchlights and star shells, in general optical rangefinders were limited to daytime operation. [10] During the latter part of World War II, radar was used to determine the range to the target.