Not up the rectum - in the ass. It's also a good way to get faster from the draw. Draw against a partner and fire. The loser has to turn around and take one in the cheek. Very effective. You will grow eyes in the back of your head and be fast like Billy The Kid after about three go 'rounds.
Penalties for losing are very stress inducing - the greater the penalty, the more the stress. Of course the ultimate penalty in a firefight is the ultimate stress inducer - but dedicated training partners can be hard to find.
The 18D course used to culminate in a trauma exercise. Pass or fail. If you passed, odds were great you would wear a beret shortly. If you failed, you went "Needs of the Army". Whole thing had a max time limit of 20 minutes. Relatively simple exercise practiced a thousand times during the course. Except for under fire, I have never experienced or witnessed anything else like it in my life. It will definitely separate the wheat from the chaff.
