The BTR-152 is a six-wheeled Soviet armored personnel carrier (APC) built on the chassis and drive train of a ZIS-151 utility truck. It entered service with a number of Warsaw Pact member states beginning in 1950, and formed the mainstay of Soviet motor rifle battalions until the advent of the amphibious BTR-60 series during the 1960s. BTR stands for bronetransportyor (). BTR-152s were available in several marks, and were manufactured in large numbers for the Soviet military and export. Late production models utilized automotive components from the more reliable ZIL-157 truck. Three primary variants of the BTR-152 appeared between 1950 and 1959: the base armored personnel carrier with a single pintle-mounted 7.62mm or 12.7mm machine gun, an unarmed command vehicle with a higher roofline, and an anti-aircraft variant armed with a ZPU-2 mount. BTR-152s could carry a single infantry squad each, or specialist weapons teams along with their mortars and anti-tank equipment. In Soviet service, a number were also deployed as artillery tractors. History Development During World War II, Red Army tacticians favored combined arms offensives, which emphasized the deployment of light infantry in concert with tanks. However, the Soviet infantrymen lacked the armored protection and rapid mobility of the tanks, and remained comparatively vulnerable to enemy fire. By the end of the war, the initial Soviet tactic of tank desant, in which the infantry rode into battle atop the tanks they were supporting, had been superseded by the introduction of M3 Half-tracks and M3 White armored cars. These were widely used for troop transport, giving rise to a new doctrine in which armored vehicles capable of keeping pace with tanks brought infantry to an engagement. The infantrymen would then disembark and enter combat on foot. Wartime experiences demonstrated that the Red Army had an urgent postwar requirement for more wheeled armored vehicles, and the general staff specified a new reconnaissance vehicle and armored personnel carrier (APC). The APC had to be capable of transporting at least eight troops. A new design bureau at the Gorkovsky Avtomobilny Zavod (GAZ) was set up to study potential concepts accordingly; their final prototype, the Izdeliye 141 (BTR-40), was accepted into service but was regarded as too small to be used in an APC role. Meanwhile, specifications for another APC had been issued, capable of seating 15 to 20 additional passengers and armed with a single heavy machine gun. Existing M3 half-tracks and captured