 This device was pioneered by the Royal Canadian Navy and was called "Beartrap".The U.S. Navy implementation of this device, based on Beartrap, is called the "RAST" system (for Recovery Assist, Secure and Traverse) and is an integral part of the LAMPS Mk III (SH-60B) weapons system.A secondary purpose of the haul-down device is to equalize electrostatic potential between the helicopter and ship.