The BRDM-1 (Bronirovannaya Razvedyvatelnaya Dozornaya Mashina, Бронированная Разведывательная Дозорная Машина, literally "armored reconnaissance/patrol vehicle"^[3]) is a Soviet amphibious armored scout car. It was the first purpose-built Soviet reconnaissance vehicle to enter service since the BA-64 and was built on the chassis and drive train of the BTR-40 armored personnel carrier. It is the world's first mass-produced combat vehicle of its class. ^[1]