Keywords: US Navy 110528-N-JC271-110 Mass Communication Specialist 3rd Class Sebastian McCormack, assigned to Fleet Combat Camera Group, Pacific, crawls thro.jpg en SNOW VALLEY Calif May 28 2011 Mass Communication Specialist 3rd Class Sebastian McCormack assigned to Fleet Combat Camera Group Pacific crawls through the mud on his way through the third obstacle of the Tough Mudder competition Tough Mudder is a 10-mile obstacle course designed by British special forces to challenge a competitor's strength and endurance U S Navy photo by Mass Communication Specialist 1st Class Matthew D Leistikow/Released 2011-05-28 110528-N-JC271-110 Navy http //www navy mil/view_image asp id 101877 U S Navy photo by Mass Communication Specialist 1st Class Matthew D Leistikow PD-USGov-Military-Navy Images from US Navy location SNOW VALLEY Calif Obstacle courses Mud People and barbed wire Mass Communication Specialist |