San Francisco Air Defense Region ended in 1945.
Los Angeles Air Defense Region was created in 1942.
Detroit Air Defense Sector was created in 1958.
IX Air Defense Command was created in 1944.
Highlands Army Air Defense Site was created in 1958.
Air Defense Artillery Branch - United States - was created in 1968.
NORAD (North American Aerospace Defense Command) is a joint organization of Canadaand the US that provides aerospace warning, air sovereignty, and defense for the twocountries.NORAD's headquarters facilities in Colorado are administered by the US Air Force underthe command of the 721st Mission Support Group, part of the 21st Space Wing. NORAD'sforces consist of the Alaskan NORAD Region/Eleventh Air Force, Canadian NORAD Region,and Continental NORAD Region.US Headquarters and forces are funded as part of the US Air Force under the US Department of Defense.-- Wikipedia --
IX Air Defense Command ended in 1946.
Detroit Air Defense Sector ended in 1966.
Southeast Air Defense Sector ended in 2006.
The region where we do not find air is space.
The IM 99A and IM 99B were umanned interceptors assigned to Air Defense Command and ultimately, NORAD. It was flown by remote control from the air defense region command blockhouse located around the country. If launched it was on a one way trip as it would be directed to a bomber formation and then exploded. It was ramjet powered and could approach Mach 4. A very effective air defense system against manned bomber attack.