Students from the Basic Underwater Demolition/SEAL class 281 participate in a rock portage exercise on Coronado Island, Calif., Feb. 23, 2010. Rock portage is one of many physically demanding evolutions included in the first phase of training. Navy SEALs are the maritime component of U.S. Special Forces and are trained to conduct a variety of operations from the sea, air and land. U.S. Navy photo by Petty Officer 2nd Class Kyle D. Gahlau
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