The BTR-40 is a Soviet non-amphibious, 4-wheel drive armoured personnel carrier and reconnaissance vehicle. The BTR-40 built on the GAZ-63 chassis. Featuring a sloping front, flat rear, and open roof, some variants have an armored roof. It is also the first mass-produced Soviet APC. It was eventually replaced in the APC role by the BTR-152 and in the reconnaissance vehicle role by the BRDM-1.