One of the best learning experiences in my life was when I flunked my first ARTEP. I won't go into the gory details, but it woke me up, to put it mildly.
I caught so much flak from my battery commander, must have lasted at least a month. You know, straight out of the Platoon Leaders Guide: everything my unit does, or fails to do, is my responsibility.
From that point on, I was a PITA to deal with, because if my neck is truly on the line, stay the hell out of my way and let me do my job.