The speed was verified by the USAF ARIS radar. It also fired the Navy's first vertically launched missile (an SM-2) while doing 60 knots (110 km/h). It was also used to test automatic ride control and high speed collision avoidance and navigation systems. The 100A ship was used to test waterjet propulsion, variable geometry inlets and automatic ride control systems. The 100A and 100B were both capable of operating almost completely out of the water on an air cushion with only 18in (46 cm) of sidewall, the propellers or the waterjet inlets entering the water. The 100-ton SES 100B was built for the US Navy as a 1/10 scale model to test the feasibility of using hovercraft and other Surface Effect Ships in combat situations. The top-secret specifications called for a ship capable of entering a combat zone at a speed of over 80 knots (150 km/h) and disgorging a tank and 100 soldiers onto a beach, turning back out onto water and escaping at high speed.