The Royal Navy is to receive at least four new Astute class submarines, boats being delivered in 2009, 2010, 2012 and 2014 - 3 or 4 more are planned. The Swiftsure-class will be entirely decommissioned by 2010. HMS Trafalgar is to be decommissioned in 2008, followed by HMS Turbulent in 2011. The Astute Class submarine will be the biggest nuclear Fleet submarine ever to have been in service with the Royal Navy, nearly 30% larger than its predecessors. This is due to the powerplant, the Rolls Royce PWR2 reactor (developed for the Vanguard class SSBN). The armament of Astute class is set to be 38 Spearfish torpedos (the British equivalent of the US Mk48 ADCAP torpedos), Tomahawk Block III/IV Cruise Missiles and submarine launched mines.