Lt. Col. Eric Haagenson, Washington, D.C., Air National Guard pilot, prepares for his flight during a simulated alert mission at the 113th Fighter Wing’s Aerospace Control Alert Detachment, Joint Base Andrews, Md., March 30, 2015. The 113th ANG reached 5,000 alert missions, March 21, as part of an air defense system for the nation’s capital. The alert unit was created in response to the September 11, terrorist attack on the United States in 2001. (U.S. Air Force photo/Airman 1st Class Philip Bryant)