Alert over Germany accidentally shot down a Royal Air Force Jaguar GR.1. In the strike role the FGR.2s could carry the SNEB rocket pod, bomb, the BL755 Cluster Bomb Unit, and U.S.-supplied B28, B43, B57 or B61 nuclear weapons. It could also be fitted with SUU-16/A and SUU-23/A gun pods. From 1975 the aircraft were modified with structural reinforcements and tail-mounted radar warning receivers. When the aircraft took over the air-defence duties in the 1970s they carried either AIM-9G Sidewinders or AIM-7 Sparrows, and later they would carry the then new British Aerospace Skyflash missile and the updated AIM-9L Sidewinder. In the 1980s, the Tornado started to replace the Phantom in the air-defence role. The Greek Air Force (Polemiki Aeroporia, PA) was interested in buying 32 aircraft in 1992 but the differences were too great between the FGR.2 and the F-4Es they operated. F-4J(UK) (Phantom F.3) The deployment of a squadron of Phantom FGR.2s to the Falkland Islands after the 1982 War left a gap in the RAF's air defences. With the Tornado ADV still some years from operational service, the RAF purchased 15 second-hand former U.S. Navy F-4J aircraft, chosen from among the best stored at Davis-Monthan Air Force Base and upgraded to a level almost equal to the F-4S. Although they were officially designated as the Phantom F.3, this was rarely used, instead being generally referred to as the F-4J(UK). The main difference was the absence of combat slats as requested by the RAF, since they were considered to be a "source of drag". This also simplified the training of RAF crews as slats were not fitted to other RAF Phantoms. The aircraft were totally overhauled at Naval Air Station North Island and fitted with AWG-10B radar (having Skyflash missile guidance capability, with monopulse I band sensor), smokeless engines and provision for Skyflash missiles. The first F-4J(UK) was delivered to the RAF on 2 August 1984 and from there RAF crews delivered the aircraft to the UK after training. They entered service with No. 74 Squadron (Tiger Squadron), based at RAF Wattisham in the air-defence role. Crews liked the aircraft, and generally rated them better than the Spey-equipped FGR.2s. They had a slower rate of climb due to the less-powerful engines, but they were also lighter and able, at altitude, to reach higher speeds (Mach 2.3 at , compared to Mach 2.1 at ). The radar was also