Challenger 3 and the Future of British Armored Warfare Revealed! The Challenger 3 represents the next generation of British armored lethality. Built as an extensive upgrade to the Challenger 2, it features a brand-new turret and a 120mm smoothbore gun, allowing it to fire the most advanced NATO ammunition. Reaching speeds of approximately 60 km/h, it incorporates state-of-the-art digital architecture and the Trophy active protection system. As the British Army’s future Main Battle Tank, the Chal