air defense en
21air defense area — Airspace of defined dimensions designated by the appropriate agency within which the ready control of airborne vehicles is required in the interest of national security during an air defense emergency …
22air defense battle zone — A volume of airspace surrounding an air defense fire unit or defended area, extending to a specified altitude and range, in which the fire unit commander will engage and destroy targets not identified as friendly under criteria established by… …
23air defense emergency — An emergency condition, declared by the Commander in Chief, North American Air Defense Command, that exists when attack upon the continental United States, Alaska, Canada, or United States installations in Greenland by hostile aircraft or… …
24air defense ground environment — The network of ground radar sites and command and control centers within a specific theater of operations which are used for the tactical control of air defense operations …
25air defense operations center — See air defense control center …
26air defense readiness — An operational status requiring air defense forces to maintain higher than ordinary preparedness for a short period of time …
27air defense region — A geographical subdivision of an air defense area …
28air defense — system of defense against attacks (aircraft, missiles, etc.) which come from the air …
29air defense action area — An area and the airspace above it within which friendly aircraft or surface to air weapons are normally given precedence in operations except under specified conditions …
30air defense artillery — Weapons and equipment for actively combating air targets from the ground. Also called ADA …
