Shelia Nguyen, University of California at San Diego (UCSD), Pre-Dental Society, assigned to the Medical Treatment Facility, US Military Sealift Command (MSC) Mercy Class Hospital Ship USNS MERCY (T-AH 19), injects a local anesthesia to a patient at the Karang Rejo Puskemas-Outreach site at Tarakan, Indonesia, during a humanitarian and civic assistance visit.(U.S. Navy photo by Mass Communication SPECIALIST First Class Michael R. McCormick) (Released)