Brian Dickinson is a former U.S. Navy Aviation Rescue Swimmer who specialized in combat search and rescue. His military experience is not the most difficult situation he's ever faced. For six years, he served as a rescue swimmer, but in his post-military career, he has climbed some of the most challenging mountains in the world, including Denali, Kilimanjaro, and even the Sentinel Range in Antarctica. In 2011, Dickinson climbed Mount Everest by himself, which was a difficult challenge in...