Northrop Grumman is building a prototype of the Sky Viper, a 20 mm chain gun that could potentially be used by the Army on its Future Vertical Lift aircraft, company officials told reporters yesterday. The gun will specifically be evaluated for the Future Attack Reconnaissance Aircraft, or FARA, for which the Army plans to equip with a 20 mm cannon. The aircraft, along with the Future Long-Range Assault Aircraft, or FLRAA, is expected to be fielded by 2030 . "Really...