The Army is preparing to replace its long-serving M240B machine gun, launching a multibillion-dollar program to field a next-generation automatic weapon for frontline troops, according to newly released budget documents. Dubbed the Future Medium Machine Gun, or FMMG, the new weapon will mirror the M240B in function as a machine gun primarily for dismounted combat units. Service documents say it is intended to offer improved killing power and operational capability over the current platform,