Click to advance. - INFO - The M3 is a Cold-War Era main battle tank designed by the United States. Its official designation is Tank, Combat, Full Tracked, 120-mm Gun M3. The vehicle was based of the chassis of the M1 Abrams tank. There were 3 prototypes: XM3E1 - 105 mm T140E3 cannon XM3E2 - 120 mm L/44 M256 smoothbore gun XM3E3 - XM3E2 with smaller turret The XM3E1 and XM3E2 was deemed inferior and phased out. The XM3E3 would go on to become the M3 Earley, named after Bob Earley, tank commander of the M26 Pershing "Eagle 7". A variant of the M3 was produced, and designated M3A1. The M3A1 was fitted with an M61 Vulcan cannon, which was also used on the M163 VADS. The M3 and M3A1 saw action for a short period of time in the Gulf War. During the Gulf War, the M3 Earley was deemed inferior to the M1 Abrams due to weight and speed, and was eventually phased out, making the Abrams the United States' primary MBT.
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