Machine Gun Maintenance Navy Petty Officer 3rd Class Kristen Neufeld performs maintenance on a Mark 38-25 mm machine gun aboard the aircraft carrier USS Carl Vinson at its home port in San Diego, Aug. 18, 2016. Navy photo by Seaman Theo Shively SHARE IMAGE: Download Image: Full Size (1.16 MB) Tags: Sailors, Navy Photo By: Navy Seaman Theo Shively VIRIN: 160818-N-JM189-015C.JPG Photo Gallery