SECURE LINE A U.S. Air Force airman secures his static line before a drop training mission on North Auxiliary Airfield, S.C., April 7, 2010. The aircraft and its crew are assigned to the 15th Airlift Squadron, Joint Base Charleston, S.C. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 860633-R-YAB63-569.jpg Photo Gallery