After six years of design, development and testing in Amarillo, the Bell V-280 Valor is now in residence at the company’s flight research center in Arlington. The aircraft, designed primarily to carry troops into combat, is Bell’s entrant to replace the more than two thousand Blackhawk helicopters now in service with the U.S. Army. Bell, headquartered in Fort Worth, is competing against a Sikorsky/Boeing design in the Joint Multi-Role Technology Demonstration. The two designs are radically different. The Valor is a tiltrotor, similar to the V-22 Osprey, which has been in service with the Marines for more than a decade....