The MK-45 5-inch/54 caliber lightweight gun aboard the US Navy (USN) Ticonderoga Class Guided Missile Cruiser, USS THOMAS S. GATES (CG 51), engages targets during a live fire exercise conducted during Exercise UNITAS 46-05, while underway off the coasts of Colombia, in the Pacific Ocean. The Colombian Navy in this years UNITAS Pacific Phase host, which includes Ecuador, Panama, Peru and the United States (US)