U.S. Air Force Senior Airman Sarah Lowry, 633rd Aerospace Medicine Squadron bioenvironmental engineer technician, dons a gas mask before a fitting at Langley Air Force, Va., Jan. 9, 2015. Gas masks are tested t More
U.S. Air Force Airman 1st Class Alex McClendon, 633rd Aerospace Medicine Squadron bioenvironmental engineer technician, performs a gas mask fit test on Senior Airman Sarah Lowry, 633rd AMDS bioenvironmental eng More
U.S. Air Force Airman 1st Class Alex McClendon, 633rd Aerospace Medicine Squadron bioenvironmental engineer technician, performs a water quality check at Langley Air Force, Va., Jan. 9, 2015. The 633rd AMDS Bio More
U.S. Air Force Airman 1st Class Alex McClendon, 633rd Aerospace Medicine Squadron bioenvironmental engineer technician, tests a water sample at Langley Air Force, Va., Jan. 9, 2015. McClendon used phenol red t More
U.S. Air Force Senior Airman Felicia Still, 633rd Aerospace Medicine Squadron bioenvironmental engineer technician, uses a HAPSITE ER Chemical Identification System at Langley Air Force, Va., Jan. 9, 2015. The More