NELLIS AIR FORCE BASE, Nev.—Staff Sgt. Thomas McKrush, 57th Component Maintenance Squadron, precision measuring equipment laboratory craftsman, verifies the proper air speed and altitude pressure outputs are set correctly for the testing of various aircraft here Jan. 28. The PMEL shop is responsible for making sure all equipment needed to perform Nellis' mission is correctly aligned, measured, and calibrated. (U.S. Air Force photo by Senior Airman Nadine Y. Barclay)
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