Capt. Gregory Martin, an infectious disease doctor from Huntingdon Valley, Pa., and a Nicaraguan military doctor

110618-F-ET173-157 
SAN JUAN DEL SUR, Nicaragua (June 18, 2011) Capt. Gregory Martin, an infectious disease doctor from Huntingdon Valley, Pa., and a Nicaraguan military doctor conduct medical screenings at the Centro Civico medical site in San Juan del Sur, Nicaragua, 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) 

110618-F-ET173-157 
 SAN JUAN DEL SUR, Nicaragua (June 18, 2011) Capt. Gregory Martin, an infectious disease doctor from Huntingdon Valley, Pa., and a Nicaraguan military doctor conduct medical screenings at the Centro Civico medical site in San Juan del Sur, Nicaragua, 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)