A slew of vertical flight UAVs were on the floor at the U.S. Army’s aviation show in Nashville. All are vying for attention and maybe a demonstration contract or two. The list included: the Vigilante, carrying a Wescam 11TS infra-red sensor package, an RQ-5A Hunter (fixed wing), a half scale mock-up of the Schweizer FireScout (under development for the U.S. Navy), a co-axial helicopter called Agile E...