U.S. Naval Academy plebes navigate the low crawl obstacle during Sea Trials. U.S. Naval Academy plebes navigate the low crawl obstacle during Sea Trials, the capstone training exercise for Naval Academy freshmen in Annapolis, Md., on May 17, 2011. The plebes navigate physical and mental challenges, ranging from obstacle courses, long-distance group runs, damage control scenarios and water training to challenge them individually and as a team. SHARE: Download: Full Size (0.09 MB) Credit: VIRIN: 445093-R-JGT60-290.jpg Photo Gallery