160428-N-UD666-457 PACIFIC OCEAN (April 29, 2016) A MK 38 MOD 2 25mm machine gun aboard USS Carl Vinson (CVN 70) fires remotely during a training evolution. Carl Vinson is underway conducting sea trials off the coast of Southern California. (U.S. Navy Photo by Mass Communication Specialist Seaman Apprentice Daniel P. Jackson Norgart/Released)