Sailors assigned to the Oliver Hazard Perry-class guided-missile frigate USS Underwood fire the 40 mm saluting battery for a "pass and review" by Rear Adm. Sinclair Harris, commander, U.S. 4th Fleet, during his approach aboard the guided-missile cruiser USS Anzio (CG 68). 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)