The Vanguard-Class refers to a class of nuclear-powered ballistic missile submarines operated by the Royal Navy of the United Kingdom. These submarines are designed to carry and launch the Trident II (D5) ballistic missiles, which serve as a key component of the UK's nuclear deterrent strategy. Each Vanguard-Class submarine is equipped with advanced technology for stealth and navigation, allowing them to operate undetected in various maritime environments. The class includes four submarines: HMS Vanguard, HMS Victorious, HMS Vigilant, and HMS Vengeance, all of which play a crucial role in maintaining national security.