Meeting Marines Defense Secretary Ash Carter speaks to Marines participating in a platoon defense demonstration on Marine Corps Base Quantico, Va., March 9, 2016. Carter visited Quantico to observe Marine Corps training and speak with Marines. DoD photo by Air Force Senior Master Sgt. Adrian Cadiz Click here to see more images on Secretary Carter's Flickr page. SHARE: Download: Full Size (2.54 MB) Credit: Air Force Senior Master Sgt. Adrian Cadiz VIRIN: 160309-D-DT527-500K.JPG Photo Gallery