Like the M1 Abrams main battle tank (MBT) and the Apache family of helicopters, the U.S.-made M60 tank proved that upgrades over time can keep a weapon system viable for decades.

Summary and Key Points: The British Army’s future main battle tank, the Challenger 3, recently completed its first live-fire trials in Germany, testing the new Rheinmetall 120mm L55A1 smoothbore ...