Two F-16 Fighting Falcon's wait to take off during an alert scramble at Joint Base Andrews, Md., March 28, 2017. A scramble is a rapid response to any air defense operation and air emergency. The 113th Aerospace Control Alert facility has more than double the number of alert events than all other active duty and National Guard bases combined. (U.S. Air Force photo by Airman 1st Class Gabrielle Spalding)