PKTM09611 British Army Challenger 1 Mk 3 Main Battle TankBritish Army Challenger 1 Mk 3 Main Battle Tank (Note: When the British Challenger tank entered service in the 1980s, it was simply called Challenger. It began being referred to as Challenger 1 after Challenger 2 was designed in the late 1980s. Not to be confused with Challenger 3, the upgraded Challenger 2 2030s service life extension.) The FV4030 4 Challenger 1 originated from the Shir 2 project, a development by the United Kingdom for the Imperial