(1) activates turret. (2) activates 30mm cannon and aquatic drive. (3) activates GPMG and rear hatches. LandingGear operates trim vane and hatches. VTOL and Trim for land control, throttle and Yaw for aquatic control. Pitch and Roll to lay weapons. The BMP is a Soviet infantry fighting vehicle, designed with the requirement that it be fast, well-armed, and allow the infantry squad to fire from within. It is an evolution of the concept of the armored personnel carrier, with greater emphasis on supporting the infantry squad. Other nations would soon adopt similar vehicles. While elements such as armament, propulsion, and layout would vary between nations, the basic concept remained. This particular vehicle is a composite between the Soviet BMP-1 and BMP-2.