Rib Pin Air Force Staff Sgt. Pashala Lewis secures a pin into the second rib of a large maintenance structure on Bagram Airfield, Afghanistan, Feb. 12, 2016. Lewis is assigned to the 455th Expeditionary Civil Engineer Squadron. Air Force photo by Capt. Bryan Bouchard SHARE: Download: Full Size (0.62 MB) Tags: Bagram Airfield, afghanistan, Air Force, Airmen Credit: Capt. Bryan Bouchard VIRIN: 160212-F-IT298-006.JPG Photo Gallery