OXYGEN MASK A Marine gets his oxygen mask inspected before conducting a high-altitude, high-opening jump during sustainment training in Louisburg, N.C., June 6, 2015. The training allowed the Marines to prepare for deployment to the 5th and 6th Fleet areas of responsibility later this year. The Marine is assigned to Maritime Raid Force, 26th Marine Expeditionary Unit. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 755349-H-RFL83-613.jpg Photo Gallery