Developed for The US Navy in 1955, The SSM-8 ''Regulus” was designed for both Surface Vessel and Submarine warfare, during The Cold War. Considered a “second generation” Cruise Missile System, The ''Regulus” could be “landed” (with wheels) or Rail Launched. Early concepts also had various Mobile Land Systems experimented with. The SSM-8 was regulated to Naval Service in 1956 and was first Test launched from The American Submarine USS 'Tunny”. Later that year, most US Submarines assigned as a Nuclear Deterrent Force had “Regulus” Class Missiles on board for possible deployment. Weighing close to 15,000-pounds, The SSM-8 was 33-feet long and 5-feet in diameter. Using a Turbojet with 4,600-pounds of thrust, it was also supported by Twin Booster Rockets capable of 33,000-pounds of additional thrust. Capable of sub-sonic speeds, The “Regulus” had a 500-mile operational range. They supported a 3,000-pound Nuclear Warhead capable of 120-Megaton yields. The “Regulus” Systems (as with most early Rockets), used a Wing design for stabilization in flight. The SSM-8 had a 30-foot wingspan. By the late 1950s, most of The American Carrier Fleet in both The Pacific and Atlantic deployed “Regulus” Class Missiles, as well as smaller surface Combat Vessels. Early camera technology allowed some SSM-8s to be converted into primitive forms of Unmanned Camera Drones. Over 500 SSM-8 Missiles were produced and deployed. However, they were replaced by The ''Polaris” System in 1964. Most were converted into Target Drones.