339th Flight Test Squadron aircrew flight equipment
Airman 1st Class Khalil Smalls, 339th Flight Test Squadron aircrew flight equipment helper, reassembles components of an MBU-20/P oxygen mask April 26, 2017, at Robins Air Force Base, Georgia. The mask provides pressure breathing for aircrew and reduces the probability of G-induced loss of consciousness. (U.S. Air Force photo by Jamal D. Sutter)