An instructor, foreground, observes U.S. Sailors as they pull a combat rubber raiding craft out of the water during a nighttime navigation exercise, as part of the first phase of Basic Underwater Demolition/SEAL training at the Naval Special Warfare Center on Naval Amphibious Base Coronado, Calif., Feb. 25, 2010. (U.S. Navy photo by Mass Communication Specialist 2nd Class Shauntae Hinkle-Lymas/Released)