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Blue Light was an American counter-terrorist subunit of the 5th Special Forces Group that existed into the late 1970s.
According to Col. Charles Beckwith's memoirs, this counter-terrorist group was formed by U.S. Army Special Forces leadership to fill an important counter-terrorism gap until Delta Force became operational. He stated that the unit was disbanded when Delta Force went operational.Beckwith's memoir, Delta Force, reports that commanders of the 5th Special Forces Group were asked by top brass of the Pentagon to quickly organize a Green Beret counter-terrorist unit to fill in until Delta Force was fully operational; Beckwith estimated it would take two years. Blue Light and Delta had a somewhat adversarial relationship for those two years. The traditional Special Forces leadership felt that they could handle counter-terrorist duties within the Special Forces community (with Blue Light). Delta existed outside of that bureaucracy, with a direct line to top US Department of Defense (DOD) brass and the President. Delta therefore represented a political threat in the minds of some Special Forces commanders.Nevertheless, Delta went on to complete its initial certification exercise in July 1978, and Blue Light was deactivated shortly thereafter. Blue Light members were asked to try out for Delta. At least four successfully passed selection and training.Blue Light S-2, CPT Tim Casey, was later one of the intelligence officers assigned to JTF 1–79 which commanded the ill-fated Eagle Claw.

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