 The lighter M4A3(76)W HVSS tank became the preferred U.S. tank in the later phases of the war in Korea, due to the mechanical reliability of the M4, its ease of maintenance, and its driveability compared to the M26 tank.The U.S. Army replaced the M4 in 1957.The U.S. continued to transfer Shermans to its allies, which contributed to widespread foreign use.