Keywords: US Navy 110818-N-XD935-107 Navy Diver 2nd Class Ryan Arnold, left, assigned to Company 2-3 of Mobile Diving and Salvage Unit (MDSU) 2, prepares his.jpg en PANAMA CITY Panama Aug 19 2011 Navy Diver 2nd Class Ryan Arnold left assigned to Company 2-3 of Mobile Diving and Salvage Unit MDSU 2 prepares his MK-20 diving mask during a MK-20 mask familiarization dive with Panamanian divers as part of PANAMAX 2011 PANAMAX is an annual multinational training exercise focused on the security of the Panama Canal with participants from 17 countries and involving more than 4 500 personnel throughout the U S Southern Command U S Navy photo by Mass Communication Specialist 1st Class Jayme Pastoric/Released 2011-08-19 110818-N-XD935-107 Navy http //www navy mil/view_image asp id 105980 U S Navy photo by Mass Communication Specialist 1st Class Jayme Pastoric PD-USGov-Military-Navy PANAMAX 2011 Over/under photographs USNS Lewis and Clark T-AKE-1 Naval Base Vasco Núñez de Balboa |