My biggest bitch was that they never let me clear a jam on the range, if you never do it then you will not react.
JMHO
I saw this a couple of weeks ago. We were shooting on the range (not KD, the EMP/CMP thing) and the Marine to my right kept having FTF malfunctions. From the very first one, he'd stop dead (no pun intended) and turn to look at the PSO. After the third or fourth time, I wore into him. I asked him (amongst all my yelling)...
"Is that corporal going to be walking behind you in combat?"
"No, Top"
"Then WTF are you looking at him when your weapon doesn't work?"
He improved from that point on, but the mentality of "if you have a problem, raise your hand and wait for a coach" that we're taught on the KD range is a very hard habit to break.