Missile Blue Steel

During the early 1950s, improvements in Soviet interceptor aircraft and ground-controlled interception systems increased the vulnerability of British V bombers carrying gravity bombs. Intelligence indicating the planned deployment of Soviet surface-to-air missile systems around Moscow led the Air Staff to issue Operational Requirement OR.1132 in September 1954. This requirement sought a standoff weapon that would allow bombers to launch missiles outside the range of air defense systems. A rocket-propelled design was selected to accommodate the physical size of early nuclear warhead designs.

The missile was constructed from stainless steel to withstand skin friction heating during high-speed flight. It was powered by a two-chamber liquid-fuel rocket engine. The first chamber provided thrust for the cruise phase, while the second chamber ignited closer to the target to accelerate the missile for its final approach. Guidance was provided by an inertial navigation unit, which could be integrated with the host bomber's flight systems to assist in aircraft navigation. Although originally designed to carry the Green Bamboo boosted fission warhead, the missile was ultimately equipped with the Red Snow thermonuclear warhead.

The United Kingdom operated the missile within the Royal Air Force V bomber fleet, with service entry occurring in February 1963. Flight trials were conducted at the Woomera range in Australia starting in 1960 under Operation Blue Ranger. The system was characterized by low reliability and required up to seven hours of launch preparation. Although designed for high-altitude launch, the missile was modified for low-level deployment after the Royal Air Force transitioned the V bomber fleet to low-altitude penetration tactics. To supplement the system, the WE.177B laydown bomb was deployed. The missile was officially retired on December 31, 1970, when the United Kingdom transferred its nuclear deterrent to Royal Navy submarine-launched Polaris ballistic missiles.