Behind the scenes: PMEL flight
Staff Sgt. Micah Sheffield, 374th Maintenance Squadron Precision Measurement Equipment Laboratory physical dimensions NCO in charge, calibrates vacuum gage on a primary pressure standard at Yokota Air Base, Japan, Feb. 22, 2016. The PMEL flight ensures that every tool needed to make a quantitative measurement and to safely perform inspections and repairs on aircraft provide accurate data. (U.S. Air Force photo by Senior Airman David Owsianka/Released)
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