Instead of lying prone on a grassy field calmly shooting at a bull's eye
target, the modern soldier spends many hours standing in a foxhole or
crouching behind cover, with full combat equipment draped about his body,
looking over an area of lightly wooded rolling terrain. At periodic
intervals one or two olive drab, man shaped targets at varying ranges will
pop up in front of him for a brief time, and the soldier must instantly aim
and shoot at the target(s). When he hits a target it provides immediate
feedback by instantly and very satisfyingly dropping backward just as a
living target would. Soldiers are highly rewarded and recognized for
success in this skill and suffer mild punishment (in the form of
retraining, peer pressure, and failure to graduate from boot camp) for
failure to quickly and accurately "engage" the targets - a standard
euphemism for "kill". Lt. Col. Dave Grossman, On Killing
http://tipyomi-sender.appspot.com/showtip/Sheepdog%20Tip%20of%20the%20Day/Before%20Combat/128