Vanguard

The Vanguard class is the United Kingdom's current operational ballistic missile submarine generation. Built for the Royal Navy's Trident system, the four submarines replaced the older Resolution-class Polaris boats and maintain Britain's continuous at-sea deterrent. The class represents a strategic rather than tactical platform, designed around survivability, endurance, command security, and ballistic missile carriage.

Technically, Vanguard-class submarines are large nuclear-powered SSBNs. Royal Navy material identifies four boats: Vanguard, Vengeance, Victorious, and Vigilant. Their central payload is the Trident II D5 ballistic missile, supported by navigation, sonar, communications, periscope/optronic systems, and torpedo self-defense. Their design priority is stealthy patrol endurance rather than speed or tactical maneuver as attack submarines use it.

Operationally, Vanguard-class submarines sustain the UK's continuous at-sea nuclear deterrent. At least one boat is intended to be on patrol, hidden at sea, providing a survivable second-strike capability. The class will eventually be replaced by the Dreadnought class, but until then Vanguard remains one of the most strategically important assets in the British defense system.