When Shane Shelton had to delay his entry into the special forces to go and fight in Afghanistan the only thing that buffered his disappointment was that he would get the chance to fight. He had joined the army with an eye on putting his physical prowess to good use, but as he would come to find out, being in top physical condition is secondary once the shooting starts. Keeping a cool head and believing in your mission and in your battle buddies, especially when things get bleak requires the kind of mental toughness you can only perfect once the bullets start flying.