geggy, do you have any expertise in psychology?
From his post immediately before yours, I can confidently say:
No, he does not.
And sorry, geggy, but firefighters are not immune to freaking out, and normal people may or may not, depending. It's not a finely divided line at all.
In fact, I'd suggest that the number that freak out mentally is identical (percentage wise). The difference is in training. An untrained person freaks out and has no clue what to do or what is going on. The trained person freaks out mentally and, instead of standing dumbstruck or runing around screaming, kicks into the rote training that was drilled into them.
I've seen this in combat situations several times (although I am not a psychologist either, so my opinion is not authoritive).
However, none of these situations entails that any of these people would be more or less likely to remember anything. In fact, there have been several documented instances of soldiers in life-threatening situations taking a series of actions that got them out of it, and being able to remember only a few hazy details of the incident later (and sometimes even those hazy details are incorrect).
Training is not to keep you from freaking out, but to instill, by rote and repetition, the correct actions when you do freak out.