Nick Allen served 8 years in the US Army, earning his Green Beret. Nick's career in special operations was cut short in his first training mission where he sustained multiple concussions. Nick continued to provide value to his team for the remainder of his Army career but like so many in the military, separation and civilian life proved difficult and Nick has gone thorough many extreme ups and downs. Nick has continued to stay engaged with fellow vets through the Green Beret Foundation and through physical fitness.  Check out Nick's TED Talk. 
https://www.youtube.com/watch?v=5q83SDuyuYA