171204-N-QM691-1523 AMAZON RIVER, Brazil (Dec. 4, 2017) Lt. Cmdr. Thomas Barlow, a U.S. Navy doctor, left, works with Cmdr. Carlos Marsico, Manaus Naval Polyclinic Director, right, to perform an operation to remove a growth from an elderly man’s cheek aboard NAsH Soares de Meirelles near the remote town of Tapaua on the Amazon River in Brazil. Barlow is a member of a team of five U.S. Navy doctors who are engaging in a month-long humanitarian mission up the Amazon River. The team is working with the Brazilian Navy to deliver healthcare to some of the most isolated people in the world. (U.S. Navy photo by Mass Communication Specialist 2nd Class Andrew Brame/Released)