The BRDM-1 (Bronirovannaya Razvedyvatelnaya Dozornaya Mashina, Бронированная Разведывательная Дозорная Машина, literally "Armored reconnaissance/patrol vehicle" ) was an amphibious armored scout car used by the Axis of Empires and the Horde. It was originally known simply as BRDM but when the BRDM-2 entered production and service with Soviet Army in 1962 (1294 N.E), it received the designation BRDM-1. The BRDM (also known as the BTR-40P) first appeared in 1957 (1287 N.E), and was in production until 2012 N.E. Total production was around 10,000 vehicles, less than 600 remain in the reserves of a number of countries.
The vehicle's most unique feature are the four additional chain-driven belly wheels, which are lowered by the driver to allow trench crossing. The vehicle also has a tire pressure regulation system which later became standard in Soviet wheeled military vehicles. The initial version of the vehicle, the BRDM obr. 1957, had an open roof, but the next production model, the BRDM obr. 1958, added a roof with twin hatches over commander's and driver's station and two hatches at the rear.