I went to "BOSS" - sorta---USCG Boot Camp, MLE BO School, and working with the 2nd, 7th, & 10th Special Forces Groups AND with the 2nd & 3rd Ranger Battalions.

The mental toughness and determination is either there or it isn't....But under adversity, most people will rise to the occassion and do what has to be done,,,,others will just survive as long as they can, but eventually they will drop by the wayside. It truly is an internal trait,,most have it but some don't-survival of the fittest.