Blue Light was a unit of the 5th Special Forces Group that existed into the early 1980s. According to Col. Charles Beckwith`s memoirs, this counter-terrorist group was formed by U.S. Army Special Forces leadership who disagreed with or felt politically threatened by Beckwith`s Delta Force, which existed outside of the Special Forces hierarchy. H.....
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http://en.wikipedia.org/wiki/Blue_Light
[pyrotechnic signal] Blue light is an archaic signal, the progenitor of modern pyrotechnic flares. Blue light consists of a loose, chemical composition burned in an open, hand-held hemispherical wooden cup, and so is more akin to the flashpan signals of the Admiral Nelson era than the modern, encased signal flares, often launched by mortar ...
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http://en.wikipedia.org/wiki/Blue_light_(pyrotechnic_signal)
Blue light was British army Second World War slang for an exaggerated rumour.
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http://www.probertencyclopaedia.com/browse/ZB.HTM
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