and Research Agency test-fitted an FA2 with AVPRO UK Ltd's Exint pods, small underwing compartments intended to be used for deployment of special forces. In 2005, a Sea Harrier was modified with an 'Autoland' system to allow the fighter to perform a safe vertical landing without any pilot interaction. Despite the pitching of a ship posing a natural problem, the system was designed to be aware of such data, and successfully performed a landing at sea in May 2005. Operational history Royal Navy Entry into service The first three Sea Harriers were a development batch and were used for clearance trials. The first production aircraft was delivered to RNAS Yeovilton in 1979 to form an Intensive Flying Trials Unit, 700A Naval Air Squadron. In March 1980 the Intensive Flying Trials Unit became 899 Naval Air Squadron and would act as the landborne headquarters unit for the type. The first operational squadron, 800 Naval Air Squadron, was also formed in March 1980 initially to operate from HMS Invincible before it transferred to HMS Hermes. In January 1981, a second operation squadron 801 Naval Air Squadron was formed to operate from HMS Invincible. Falklands War Sea Harriers took part in the Falklands War () of 1982, flying from HMS Invincible and HMS Hermes. The Sea Harriers performed the primary air defence role with a secondary role of ground attack; the RAF Harrier GR3 provided the main ground attack force. A total of 28 Sea Harriers and 14 Harrier GR3s were deployed in the theatre. The Sea Harrier squadrons shot down 20 Argentine aircraft in air-to-air combat with no air-to-air losses, although two Sea Harriers were lost to ground fire and four to accidents. Out of the total Argentine air losses, 28% were shot down by Harriers. One Sea Harrier alone, flown by RAF Flight Lieutenant David Morgan, shot down two Skyhawks in a single encounter. A number of factors contributed to the failure of the Argentinian fighters to shoot down a Sea Harrier. Although the Mirage III and Dagger jets were faster, the Sea Harrier was considerably more manoeuvrable. Moreover, the Harrier employed the latest AIM-9L Sidewinder missiles and the Blue Fox radar. Contrary to contemporary reports that "viffing" proved decisive in dogfights, the maneuver was not used by RN pilots in the Falklands as it was only used in emergencies against enemies unfamiliar with the aircraft. The British pilots noticed Argentinian