The MK 15 Phalanx Close-In Weapons System (CIWS) fires a short burst during a Pre-Aim Calibration Fire (PACFIRE) from Ticonderoga-class guided-missile cruiser USS Chosin (CG 65). Chosin is currently underway for routine training in the Hawaiian OPAREA. (U.S. Navy photo by Fire Controlman Second Class Andrew Albin/Released)