There are plenty of stories of even trained and experienced opposing soldiers encountering each other at very short range, firing lots of rounds, and not hitting each other. And there is a lot of clinical evidence for the episodes that don't make it into stories, where the wrong guys get shot just because they're closer than the enemy.
In the panic of suddenly having to kill or be killed, the legs going to jelly thing doesn't necessarily go away with practice. The good guys in the movies always shoot straight, because they're the good guys in the movies. The doofy storm troopers who can never hit anything are actually the realistic part.
I don't think I've ever seen that word written out before.