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Repetitive drilling attempts to make recruits more or less equally effective at all distances up to the maximum effective distance of the weapon, although response time is expected to suffer if accuracy is to be maintained.  Experience is achieved when the activity becomes muscle memory. It is hoped that soldiers who need to return fire do so instinctively, in reaction response  to the external world, in a way  no different than one learns to expect expecting  an oncoming cars car's  behavior in an intersection.