Keywords: US Navy 110718-F-ET173-068 Max Gyllenskog and Cmdr. Mark Riddle onduct a site survey of a landfill in Ayacachapa, El Salvador.jpg en AYACACHAPA El Salvador July 18 2011 Max Gyllenskog left from Smithfield Utah an environmental health scientist and volunteer embarked aboard the Military Sealift Command hospital ship USNS Comfort T-AH 20 and Cmdr Mark Riddle from Truckee Calif a preventative medicine physician conduct a site survey of a landfill in Ayacachapa El Salvador during Continuing Promise 2011 Continuing Promise is a five-month humanitarian assistance mission to the Caribbean Central and South America U S Air Force photo by Staff Sgt Alesia Goosic/Released 2011-07-18 110718-F-ET173-068 Navy http //www navy mil/view_image asp id 104420 U S Air Force photo by Staff Sgt Alesia Goosic PD-USGov-Military-Navy USNS Comfort in El Salvador 2011 Rivers of El Salvador |