110718ET173-068 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. ( Air Force

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Keywords: 2011, ayacachapa, comfort, continuing, el, landfill, promise, salvador, site, survey, usns