Tanks of the United States US allies it was also used in conflicts beyond World War II. A 24-volt electrical system was used in the M4. Early Shermans mounted a 75 mm medium-velocity general-purpose gun. Although Ordnance began work on the Medium Tank T20 as a Sherman replacement, ultimately the Army decided to minimize production disruption by incorporating elements of other tank designs into the Sherman. Later M4A1, M4A2, and M4A3 models received the larger T23 turret with a high-velocity 76 mm M1 gun, which reduced the number of HE and smoke rounds carried and increased the number of anti-tank rounds. Later, the M4 and
Australia in the Korean War No. 77 Squadron operated in the ground attack role from December 1951 until the end of the war; it remained in South Korea on garrison duties until returning to Australia in November 1954. The Battle of Sunchon was an air battle fought near the city of Sunchon on 1 December 1951, 12 Gloster Meteor jets of the RAAF's No. 77 Squadron were attacked by 40–50 Chinese MiG-15s. Despite their Meteors having inferior manoeuvrability to the Soviet-built MiGs, the Australian pilots managed to score their first victories of the Korean War, for the loss of three aircraft. Accounts vary, with the