service in the US soon after the end of the war. Korean service The M1 anti-tank gun was the main anti-tank weapon operated by the Korean military during the early stages of the Korean War. The South Korean military acquired 117 M1s when the U.S. Forces Korea withdrew from Korea in 1948-49, and the military deployed six guns to each infantry regiment's anti-tank battery. Due to the low number of anti-tank guns, the South Korean military expressed concern over the possibility of the possession of tanks by the North Korean military; however, the U.S. military advisers neglected the concern and claimed South Korea's poor road and bridge conditions are not suitable for effective tank operations. When the Korean War broke out in 1950, the South Korean military actively used M1 anti-tank guns against North Korean tanks and self-propelled guns, but did not have much effect. Armor-piercing (AP) ammunitions did not have enough firepower to penetrate North Korean tanks, and nearly 70 % of the 35,000 shells were anti-personnel high-explosives (HE). The South Korean military tried to overcome the disadvantage by firing at close range or concentrating on weak parts, but it did not have a significant impact on the war situation. The South Korean military operated the M1 anti-tank gun as an infantry-assisted firearm from 1950 to 1951, and gradually retired it by replacing it with a M20 Super Bazooka and M20 recoilless rifle. In the end, M1s were eliminated during the war without much achievement due to lack of performance. Other operators In addition to being used by the US, UK and other Commonwealth forces, the M1 was supplied under the Lend-Lease program to the Free French Forces (653), USSR (400) and Brazil (57). Guns captured by the Germans were given the designations 5.7 cm PaK 209(e) and 5.7 cm PaK 202(a). The Israel Defense Forces employed the 6-pounder in the 1950s in brigade-level anti-tank battalions and battalion-level anti-tank platoons (the latter formations were disbanded in 1953). By late 1955, the Israel Defense Forces possessed 157 pieces and 100 more were purchased from the Netherlands in 1956, too late to enter service before the Suez Crisis. Some of those are described as "57-mm guns, nearly identical to the 6-pounders and firing the same ammunition", which apparently makes them US-built M1 guns. The gun was also used by the Pakistani Army; numerous examples can still be seen as "gate guards"