Depends.
The US military tries to make it a purely reactionary action. In basic you shoot at siloets (sp?). This causes muscle memory to take over active thinking, causing the action of seeing/aiming/firing to be cut down to almost instantaneous. Of course this causes dangers of friendly-fire, but is lessened by strict and repetative training. Added to this the US takes into account creating helmet and equipment designs that are different enough from most of the world's military to allow what is called hand/eye instant interruption (your hand stops firing before your brain even realizes it's a friendly). Hard to explain to most people, but even CS players have it if they play FF on for more than a few games.
The average person without this muscle-memory training actually hardly fires in combat. The training above was created because studies after WW2 showed less than 1/4 of soldiers in combat fired their weapons, most were too afraid, thought too much, or were too worried about shooting friendlies that they just aimed down field and watched.
So, hense the answer depends. CS is nothing like the real thing, explosions, noise, pain, none of these can be convayed in a video game.
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