The Regulus 1 was the first operational U.S. Navy cruise missile. Designed to attack ground targets, it carried a nuclear warhead, flew at subsonic speeds up to an altitude of 9,144 meters (30,000 feet), and had a range of 800 kilometers (500 miles). A turbojet engine powered the missile to its target after two boosters were jettisoned. The missile was deployed on several aircraft carriers, heavy cruisers, and submarines (in watertight containers on the deck) from 1955 to 1964. Radio signals from a control aircraft or other submarines were the primary means of guiding the missile. The Polaris, the first U.S. submarine-launched ballistic missile, replaced the Regulus 1. Chance Vought built this missile and the U.S. Navy transferred it to NASM in 1988.