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Aviation Boatswain's Mate (Equipment) 2nd Class Alexa Bernas, assigned to the aircraft carrier USS Theodore Roosevelt (CVN 71), crawls through the mud obstacle course during the 2012 All-Military Wilderness Challenge. The challenge pits teams from all five branches of the armed forces through a two-day, 52-mile extreme outdoor race. The U.S. Navy has a 237-year heritage of defending freedom and projecting and protecting U.S. interests around the globe. Join the conversation on social media using #warfighting. U.S. Navy photo by Mark Piggott) 121005-N-PK884-012