Senior Airman Shakira Jackson, 22nd Aerospace Medicine Squadron bioenvironmental technician, gets a velocity reading of a ventilation system, July 29, 2015, at McConnell Air Force Base, Kan. Readings are obtained once a quarter, depending on the chemicals used in a particular work center, to ensure the area is safe for use by Airmen. (U.S. Air Force photo by Senior Airman Trevor Rhynes)