An ambulance bus backs up to the Mississippi Air National Guard C-17 Globemaster III as airmen prepare to unload patients at Joint Base Andrews, Maryland, April 26, 2018. The bus transports the ill and/or injured to Walter Reed National Military Medical Center in Bethesda, Maryland. JBA and Travis Air Force Base, California, serve as the primary military entry points or hubs for patient distribution within the Continental United States. (U.S. Air Force photo by Karina Luis)