This is where training kicks in.
Developing instincts that go counter to the natural reaction most humans have to a situation.
Routine, muscle memory, ect.
I remember a young LEO I ran into a while back that I asked about what his dept. had for trunk monkeys these days.
He said they had ARs now.
What manufacture? Don't know.
How are you with it? Ok I guess, just shot it one time last year.
You got one of your own you shoot? No.
Think about it, if this kid's ( A kid to me anyway) life ever depended on using that thing, he's done.
His wife is going to be a widow and his kids fatherless because he most likely won't even remember where the safety is. Never mind under duress.
A good number of the folks on this board shoot at least weekly.
How much range time and training did the good Sargent get in?
I bet not a tenth of that.