As a product of the British system, which has always prided itself on filtering out the 'unsuitable', I'd actually say yes - normally it's unlikely for people without a high standard of personal discipline to survive basic training, with its screaming corporals and endless hours of doing pointless, back-breaking work, without hearing the dulcet tones of "Sergeant... Getthathorriblelittlemanawaygethimbeastedgethimjailedandgethimoffmycamp... RIGHTTHISSECOND!. However I know that other countries don't demand such high standards; they have accordingly more recruits pass training and a different outlook on life which does, regrettably, lead to more nutcases slipping through the net.
