160818-N-JM189-015 SAN DIEGO (Aug. 18, 2016) Gunner’s Mate 3rd Class Kristen Neufeld performs maintenance on a Mark 38 - 25 mm machine gun system aboard the aircraft carrier USS Carl Vinson (CVN 70). Carl Vinson is pierside at homeport in San Diego. (U.S. Navy photo by Mass Communication Specialist Seaman Theo Shively/Released)