180206-N-UH865-610 CORONADO, Calif. (Feb. 6, 2018) Basic Underwater Demolition/SEAL students participate in Surf Passage at Naval Amphibious Base Coronado. Surf Passage is one of many physically demanding evolutions that are a part of the first phase of SEAL 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 Mass Communication Specialist 1st Class Lynn F. Andrews/Released)