Sailors handle lines as the Oliver Hazard Perry-class guided-missile frigate USS Underwood (FFG 36) conducts a replenishment-at-sea with USNS Patuxent (T-AO 201) during UNITAS. UNITAS Atlantic 53-2012 is a combined South America- and U.S. 4th Fleet-sponsored annual exercise that incorporates participants from Brazil, Canada, Colombia, Dominican Republic, Mexico, and the United Kingdom and the United States (host nation). (U.S. Navy photo by Mass Communication Specialist 2nd Class Stuart Phillips/Released)