Three of Britain's four Vanguard class nuclear submarines have gone to sea, The Times claims. This is the first case in more than five years. According to British military doctrine, one of the Vanguard class submarines is constantly at sea on combat duty. The other two are apparently involved in training and preparation for future patrol operations. We are at MAX.

Three of Britain's four Vanguard class nuclear submarines have gone to sea, The Times claims. This is the first case in more than five years. According to British military doctrine, one of the Vanguard class submarines is constantly at sea on combat duty. The other two are apparently involved in training and preparation for future patrol operations. We are at MAX.