The Royal Navy Vanguard class SSBN, HMS Vigilant, successfully test launches a UGM-133 Trident II nuclear submarine-launched ballistic missile.
Each Vanguard-class submarine can carry a maximum of 192 nuclear warheads, although the Royal Navy originally insisted that each boat would carry no more .
Unlike its Polaris missile-armed predecessor, the Resolution class the British Vanguard-class nuclear .
Vanguard Class Submarine .