GIANT KILLER is a military Air Traffic Control (ATC) call sign used within certain regions of the contiguous United States (CONUS). The call sign is given to air traffic controllers responsible for flight operations within restricted military airspace reserved for combat training exercises. The call sign is commonly published in NOTAMs that designate restricted airspace reserved for military flight operations or combat exercises where normal airspace separation rules do not apply. Previous to the use of the call sign, no standardized identification method existed for civilian or military aircraft to communicate to the managing controller.
To reduce the confusion and to ensure standardized emergency communication procedures among the various branches of the U.S. military, the call sign GIANT KILLER is used to denote the controlling authority for a specific portion of military airspace dedicated to combat training. In rare circumstances, the call sign may be used during a national emergency when a specific controller has been assigned a section of airspace. This was the case on September 11, 2001 when US Navy personnel utilized the call sign to vector three F-16s from Langley Air Force Base to the National Capital Region for air defense purposes. It is possible for a specific controller to utilize more than one call sign, with GIANT KILLER being one of them. For clarity, the name is always written in capital letters with a space between the words....LESS