U.S. airmen with the 48th Air Expeditionary Group perform maintenance on an F-15C Eagle aircraft at Siauliai Air Base, Lithuania, March 7, 2014. The U.S. Air Force assumed command of the NATO Baltic air policing mission for a four-month rotation from January to May of 2014. (U.S. Air Force photo by Airman 1st Class Dana J. Butler/Released)