453rd Chemical Battalion
453rd may refer to: *453d Electronic Warfare Squadron, United States Air Force unit *453d Operations Group, inactive United States Air Force unit See also *453 (number) * 453, the year 453 (CDLIII) of the Julian calendar *453 BC __NOTOC__ Year 453 BC was a year of the Roman calendar, pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Quinctilius and Trigeminus (or, less frequently, year 301 ''Ab urbe condita''). The denomination 453 BC ...

453d Electronic Warfare Squadron
The 453d Electronic Warfare Squadron is a United States Air Force unit. It is assigned to the 850th Spectrum Warfare Group and is stationed at Lackland Air Force Base, Texas. Mission The 453d provides electronic warfare (EW) support to Department of Defense and coalition warfighters. It provides EW support through four flights, operating to provide radio frequency (RF) and other EW analyses and create a realistic training environment for the warfighter. Its products and services are utilized in a variety of areas, including mission planning, training, and exercises. * The Flagging Analysis flight provides tactical comparison of current expectations to current reality to prepare warfighters to deploy and operate. It monitors worldwide threat environment to detect and identify of new or changed threat radars that may impact the performance of aircraft EW systems. * The Operations flight analyses active and passive RF-based Sensor, EW & Command, Control & Communications and ...
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453d Operations Group
The 453rd Bombardment Group is an inactive United States Air Force unit that was first organized in June 1943, during World War II, as a Consolidated B-24 Liberator heavy bomber group. After training in the United States, it deployed to England in December 1943, and, starting in February 1944, participated in the strategic bombing campaign against Germany with Eighth Air Force. Its 733d Bombardment Squadron completed 82 consecutive missions without a loss, a record for Eighth Air Force bomber units. James Stewart, of film fame, was group operations officer from 31 March to 1 July 1944. The group was programmed for redeployment to the Pacific and returned to the United States in May 1945 for training, however the Japanese surrender cancelled these plans and the group was inactivated in September 1945. The group was redesignated the 453rd Operations Group and activated at Fairchild Air Force Base in June 1992 to command Air Mobility Command (AMC)'s air refueling units at Fai ...
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453 (number)
400 (four hundred) is the natural number following 399 and preceding 401. Mathematical properties 400 is the square of 20. 400 is the sum of the powers of 7 from 0 to 3, thus making it a repdigit in base 7 (1111). A circle is divided into 400 grads, which is equal to 360 degrees and 2π radians. (Degrees and radians are the SI accepted units). 400 is a self number in base 10, since there is no integer that added to the sum of its own digits results in 400. On the other hand, 400 is divisible by the sum of its own base 10 digits, making it a Harshad number. Other fields Four hundred is also * The Four Hundred (oligarchy) of ancient Athens. * An HTTP status code for a bad client request. * The Four Hundred (sometimes The Four Hundred Club) a phrase meaning the wealthiest, most famous, or most powerful social group (see, e.g., Ward McAllister), leading to the generation of such lists as the Forbes 400. * The Atari 400 home computer. * A former limited stop bus route w ...
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