Their replacement is necessary if the Royal Navy is to maintain a continuous at-sea deterrent (CASD), the principle of operation behind the Trident system. The Vanguard submarines entered service in the United Kingdom in the 1990s with an intended service life of 25 years. Like their predecessors they will carry Trident II D-5 missiles. The Dreadnought class is the future replacement for the Vanguard class of ballistic missile submarines. 8 to 12 Lockheed Trident II D5 SLBMs (carrying up to 8 warheads each).4 × 21 inch (533 mm) torpedo tubes for: Spearfish heavyweight torpedoes.Limited only by food and mechanical components Rolls-Royce PWR3 nuclear reactor, turbo-electric drive, pump-jet Nuclear-powered ballistic missile submarineġ7,200 t (16,900 long tons 19,000 short tons)
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