Active service unit

Active service unit at a 1981 hunger strikes commemoration in Galbally, County Tyrone, 2009, as part of a re-enactment. The weapons are a Beretta AR70, a MAC-10 machine pistol (with sound suppressor) and an AK-47 assault rifle.
Wall plaque in Great Denmark Street, Dublin where the 1919 IRA Active Service Unit of the Dublin Brigade was founded. Every Brigade had an Active Service Unit; these were also called "Flying Columns."

An active service unit (ASU; Irish: aonad seirbhíse cogúla) was a Provisional Irish Republican Army (IRA) cell of four to ten 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. The concept was first pioneered by Tom McEllistrim and other members of the Irish Republican Army.

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