This isn't a new idea: the Army adopted the theory during the Viet Nam war with "Quick Kill," a training program that taught instinctive close-range shooting using Daisy BB guns with the sights removed. Trainees learned to shoot metal disks out of the air, shotgun-style, then moved on to engage pop-up targets on the ground. In some cases, they even engaged one another in BB gun fights. For a time, Daisy also marketed "Quick Kill" to civilians, renamed "Quick Skill." The kits came with sightless BB guns, safety glasses and 4-inch aluminum disk targets.