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The UK Trident programme is the United Kingdom's Trident missile-based nuclear weapons programme. Under the programme, the Royal Navy operates 58 nuclear-armed Trident II D-5 submarine-launched ballistic missiles and around 200 nuclear warheads on 4 Vanguard-class ballistic missile submarines from the Clyde Naval Base on Scotland's west coast. At least one of these submarines is always on patrol as a continuous at-sea deterrent, armed with up to 16 Trident missiles and around 48 nuclear warheads, although each submarine can carry up to 192 nuclear warheads with 12 warheads per missile. This is to be reduced to 8 missiles per boat, with a total of 40 warheads per boat, as a result of the 2010 Strategic Defence Review