The gloved right hand of Staff Sgt. Jacob Lober, 379th Expeditionary Expeditionary Maintenance Squadron Precision Measurement Equipment Laboratory craftsman, handles a steel gauge block Aug. 24, 2016, Al Udeid Air Base, Qatar. The block could be used to calibrate a micrometer, calipers or anything that have a length calibration. (U.S. Air Force photo/Technical Sgt. CarlosJ. Treviño/Released)