160426-N-MD297-026 PACIFIC OCEAN (April 26, 2016) The Arleigh Burke-class guided-missile destroyer USS Lassen (DDG 82) conducts a pre-action calibration fire (PACFIRE) with its close-in weapon system (CIWS). Lassen is underway in support of Operation Martillo, a joint operation with the U.S. Coast Guard and partner nations within the 4th Fleet area of responsibility. Operation Martillo is being led by Joint Interagency Task Force South, in support of U.S. Southern Command. (U.S. Navy photo by Mass Communication Specialist 2nd Class Huey D. Younger Jr./Released)