questionText: To ask the Secretary of State for Defence, when each Vanguard class submarine has been out of service.
answerText: The Royal Navy has provided the Continuous At Sea Deterrent for an unbroken 54 years with Operation RELENTLESS. However, we do not disclose these details for operational security reasons as to do so could or would, or would be likely to, prejudice the cap...
heading: Trident Submarines