A Canadian sailor attached to the combined Fleet Diving Unit spot checks oxygen tanks prior to commencing a familiarization dive with U.S., Panamanian, and Belizean divers as part of PANAMAX 2011 training. The Canadian divers are participating in the exercise for the first time. PANAMAX 2011 is an annual multinational training exercise sponsored by U.S. Southern Command focusing on the security of the Panama Canal. Involving 16 nations from the Western Hemisphere and more than 3,500 civil and military personnel, the 12-day exercise takes place off the coasts of Panama and the United States, including Fort Sam Houston, Texas, Miami, Naval Station Mayport, Fla., and Stennis, Miss., among others Aug. 15-26.