Airman 1st Class Chris Warmund, 57th Maintenance Squadron Precision Measurement Equipment Laboratory apprentice, calibrates a pressure and temperature test set Oct. 28, 2013, at the PMEL on Nellis Air Force Base, Nev. The PMEL is responsible for making sure all measuring equipment needed to perform Nellis AFB missions are correctly aligned and calibrated. (U.S. Air Force photo by Senior Airman Matthew Lancaster)
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