[Jack Moroney (RIP)]

Controlling one's emotions is a matter of maturity. Dealing with lack of physical courage is a matter of becoming competent in your necessary skill sets, having confidence in your training, knowing your strengths and weaknesses and dealing with them. Dealing with a lack of moral courage is a matter of a personality flaw for which there is no cure-unless you want to become a politician and become adept at talking out of both side of your mouth. I am not sure you want to deal with the adrenalin rush as much as recognize the symptoms and how you react to it so you can act in a rationale rather than a haphazard manner and that comes with experience and pushing envelope in a training situation before you put other folks at risk. Mastering how you react in these situations will allow you to exercise intelligent intiative vice just reacting as if you were following some damn immediate action drill.