Master Sgt. Keith Armour, Officer Training School 24th Training Squadron Military Training Instructor, evaluates officer trainees as they perform open ranks, April 21, 2020, Maxwell Air Force Base, Alabama. Officer Training School has been deemed an essential mission during the COVID-19 pandemic and is taking preventative measures, such as screening trainees upon arrival and wearing face coverings, to mitigate exposure. (U.S. Air Force photo by Senior Airman Alexa Culbert)