Classified was a "light" carrier and part of the Invincible class of British carriers, the Ark Royal sports an aircraft complement of various types that include the Sea Harrier jump jet aircraft (fighter and bomber versions), Sea King and Merlin type helicopters with a standard group consisting of 5 Harriers and 10 Sea Kings. Her most notable characteristic was the sloped ramp at the extreme edge of her flight deck, which sat to the port side with a superstructure at the starboard. Self-defense was accomplished through a layout of 3 x Phalanx CIWS anti-missile systems and additional 2 x 20mm cannons for anti-aircraft defense. Additionally, the class can mount 1 x twin launchers for Sea Dart surface-to-air missiles (later removed in 1999), shoring up the defense of what use to be a weakness in the design.