190221-N-ZW825-0288 POMBAL, Brazil (Feb. 21, 2019) Lt. John Sullivan performs an ultrasound examination during a medical clinic in Pombal, Brazil, Feb. 21, 2019. The visit marks the sixth stop of a month-long mission by four U.S. Navy physicians and their Brazilian Navy counterparts embarked aboard the Brazilian navy Oswaldo Cruz-class hospital ship NAsH Carlos Chagas (U 19) to exchange medical expertise and to bring medical care to isolated communities along the Amazon River. (U.S. Navy photo by Mass Communication Specialist 1st Class Byron C. Linder/Released)