The testing and training weeds out anyone who would refuse an order, and also anyone with a higher than average IQ.
I think to even apply you have to fill out a long questionnaire that indicates whether or not you're "the right stuff" to beat your own countrymen and brothers into submission.
I think to even apply you have to fill out a long questionnaire that indicates whether or not you're "the right stuff" to beat your own countrymen and brothers into submission.