190219-N-ZW825-0220 NOVA ALIANCA, Brazil (Feb. 19, 2019) Brazilian navy Cmdr. Carlos Marsico observes as Lt. John Sullivan guides Brazilian navy Lt. Giselle Costa in conducting an ultrasound examination during a medical clinic in Nova Alianca, Brazil, Feb. 19, 2019. The visit marks the fourth stop of a month-long mission by four U.S. Navy physicians and their Brazilian navy counterparts embarked aboard 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)