U.S. Air Force Airman 1st Class Xavius Camps, 1st Maintenance Squadron Precision Measurement Equipment Laboratory craftsman uses a leveling tool to make sure a plate is flat at Langley Air Force Base, Va., Sept. 23, 2014. PMEL technicians ensure accuracy and tolerance of intricate electronic and physical dimensional test equipment used throughout the lab. (U.S. Air Force photo by Airman 1st Class Breonna Veal)