Tech. Sgt. Joel Cruse, 363rd Training Squadron AMMO instructor, demonstrates how the face shield he made from a 3D printer and a few other items is properly worn at Sheppard Air Force Base, Texas, April 7, 2020. Face shields are a clear physical barrier for liquid droplets. If someone who is symptomatic coughs near or in the direction of the face of someone where the shield, it prevents those droplets from reaching facial points of entry. (U.S. Air Force photo by Staff Sgt. Robert L. McIlrath)