J,
Sorry to join the party late, but I wanted to throw in my 2 cents.
At the risk of stating the obvious, I would argue that both physical and mental stress affects people differently. People who worry a lot about life might do a task very well in a relaxed environment and then fall to pieces when put under the slightest stress. Others might be bored and do poorly in an absence of stress but then turn it on when the pressure turns up. For these folks you might find a curve where performance goes up at first as stress increases. Peformance would eventually start to come down as stress contined to increase. I suppose the majority would find some performance loss as stress increased but at a manageable level. Others would see performance plummet once stress sets in.
Since I imagine that the battlefield is a fairly stressful place it would be good to know how the soldiers and leaders in it would react under stress. It would also be handy to learn how to manage stress. The training does, I suppose, weed out the true "stress magnets", identify the ones who thrive and give the rest the ability to at least manage their reaction to stress. I observed this (purely antecdotaly) on Phase II. Some very intelligent and articulate young OCdts crumbled under the strain of time contraints (as you also observed). I can remember one fellow who was obsessed with being the top candidate (to the point of wanting our ranking listed on our shirts). He didn't make it past week five. :'(Too stressed. All self-imposed. Some panic when the clipboard comes out.
They worry about failing and worry so much that they do. On the other hand some guys are just excited to have been given a tank for an afternoon and don't dwell on the possibilities of failure. As Oddball says to his driver, "I want nothing but good thoughts. No negative waves."
I seem to remember that four guys from my section of ten failed Phase II (for a variety of reasons). Strangely, I do not remember finding that their leaving caused any stress to me. In fact, in the case of a couple it made my life less stressful. That being said, I felt bad for the guys who got hurt and had to leave despite their high levels of motivation and potential. So I guess that made me sad but not stressed. I felt stressed if I was given a warning of some kind, but I tried not to dwell on it and just tried to get on with it.
Some guys stayed up all night buffing their floors and then failed tests in the morning. My room turned in at 2300 hrs regardless. Sleep deprivation is perhaps more powerful than stress in terms of performance loss. At 72 hrs I think that most people hit the wall unless they are on some kind of stimulant. Sleep deprivation probably magnifies the negative effects of stress.
I'm sure we all have similar tales. As an aside, I do beleive that our schools teach to the standard and not to a quota. I worked at a training centre for three years and kept track of attrition rates. Army needed to know the attrition rate because it had to recruit the right amount to fill the vacancies in the battalion, not because it insisted that we have a certain of amount of failures to "stress" the candidates. We were not under a quota and if we were over or under there were no questions asked. We kept track of failures on JNCO (CLC, PLQ or whatever its called these days) and gave feedback to the units to help them make sure their candidates were qualified. The standard was all that mattered.
Cheers,
2B