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60th Aerospace Medicine Squadron Bioenvironmental Engineering Flight technicians perform N95 mask fit tests on aircrew at Travis Air Force Base, California, April 10, 2020. The bioenvironmental engineering flights conduct respirator and gas mask fit tests to protect Airmen and maintain a healthy workforce. They also perform environmental, occupational and radiological surveillance. (U.S. Air Force photo by Heide Couch)
28.0-300.0 mm f/3.5-5.6
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