The Navy's large fleet units are supported by the Royal Fleet Auxiliary which possesses three amphibious transport docks within its operational craft. These are known as the Bay-class landing ships, of which four were introduced in 2006–2007, but one was sold to the Royal Australian Navy in 2011. In November 2006, the First Sea Lord Admiral Sir Jonathon Band described the Royal Fleet Auxiliary vessels as "a major uplift in the Royal Navy's war fighting capability".