Master Sgt. Jeremy Stupperich, 436th Airlift Wing command post senior emergency actions controller, looks at a target through the M9 sight during Combat Arms Training and Maintenance class May 13, 2020, at Dover Air Force Base, Delaware. Stupperich and other CATM students wore masks whenever six feet of separation could not be maintained, whether in the classroom or on the firing range. A shelter-in-place order was issued in mid-March to help mitigate the spread of COVID-19. (U.S. Air Force photo by Roland Balik)