I've never been in a gunfight outside of the military. What I saw in the military (I only served in specialized units) in combat- and I'm only speaking of the US personnel that were there, and not "friendly indigenous troops" was probably atypical as compared to other units. When working at close quarters, typically in structures and often in an urban setting, I saw the methodical, highly drilled tactics of shooting, moving, and communicating being performed in the same way that we trained, and trained, and trained. Were their errors and hiccups? Absolutely. However, when the distance to the enemy increased (such as an engagement in the desert) less experienced team members would sometimes not be as quick on the trigger. This was probably due to a number of reasons.