U.S. Air Force Airman 1st Class Cameron Rice, 633rd Aerospace Medicine Squadron bioenvironmental engineering technician, guides Airman 1st Class Evan Ferris, 633rd Air Base Wing Command Post emergency action controller, through the gas mask fit test at Joint Base Langley-Eustis, Virginia, Feb. 5, 2019. The First Term Airman Course has implemented the test, enhancing mission readiness by making sure Airmen go through the process as soon as they arrive on station. (U.S. Air Force photo by Senior Airman Anthony Nin Leclerec)