Shelves of battery packs are charged and ready for use by Airmen of the 27th Aircraft Maintenance Unit at Langley Air Force Base Va., Feb. 15, 2013. The support technicians at the 27th AMU are responsible for ensuring all flightline technicians have the tools and equipment they need to fix and maintain aircraft. (U.S. Air Force photo by Staff Sgt. Jeff Nevison/Released)