U.S. Marine candidates participate in a field training exercise at the Officer Candidate School, Marine Corps Base Quantico, Va., June 20, 2017. (Lance Cpl. Micha R. Pierce/U.S. Marine Corps photo) ...
Don Kannenberg is a mild-mannered accountant who busts out of his office on weekends and turns into superman. Kannenberg, 57, of Avon, pursues the extreme sport of obstacle course racing. Competitors ...