Controlled environment or not, it causes your brain to run at higher temperatures and damage to nerve receptors. If they are going to use MDMA for soldiers to open up, I'd imagine it would be daily therapy.
Drug companies don't have a very good history with making safe(r) drugs. Vioxx, Ephedrine, etc.
One of the things about MDMA, it's 8 hours of unadultered fun, love and friendliness. It's a week of depression.
-SW