Blue Light (counter-terrorist subunit) Blue Light (counter-terrorist subunit) 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
Active service unit Active service unit An Active Service Unit (ASU) was a Provisional Irish Republican Army (IRA) cell of five to eight members, tasked with carrying out armed attacks. In 2002 the IRA had about 1,000 active members of which about 300 were in active service units. In 1977, the IRA moved away from the larger conventional military organisational principle owing to its perceived security vulnerability. In place of the battalion structures, a system of two parallel types of unit within an IRA Brigade was introduced. Firstly, the old "company" structures were used to supply auxiliary members for support activities such as