U.S. Navy LT. CMDR. Angela Powell (left), an otolaryngologist, assisted by Hospital Corpsman 3rd Class Daniel Vogel, a surgical technician, performs surgery aboard the Military Sealift Command, Mercy Class Hospital Ship, USNS COMFORT (T-AH 20), while underway in the Pacific Ocean on Aug. 10, 2007. USNS COMFORT is on a four-month humanitarian deployment to Latin America and the Caribbean providing medical treatment to people from a dozen countries. (U.S. Navy PHOTO by Hospital Corpsman 1ST Class Jean A. Wertman) (Released)