Headquarters was originally in the ancient Gough Barracks in Armagh City, formerly home to the Depot, Royal Irish Fusiliers,[4] but was later moved to purpose-built accommodation on a new site on the Hamiltonsbawn Road called Drumadd Barracks[5] which was shared with the regular army and also later served as an HQ for 3 Infantry Brigade.

At various times the battalion had companies in Armagh,[6] Loughgall,[7] Glenanne,[8] and Lurgan,[9] plus platoons in Keady and Newtownhamilton.

Where possible accommodation was sought in army bases and although the old Ulster Special Constabulary platoon huts were vacant and available, to have used those would have highlighted further the links between the UDR and the disbanded USC.

[4] Due to its location and patrol territory in the "bandit country" of South Armagh, this was one of the most heavily engaged battalions of the Ulster Defence Regiment and had the longest list of casualties.

[13] On one occasion when a proxy bomb arrived at the barracks, they had to clear the area and carry several children to safety before the 30 pounds (14 kg) device exploded.

[13] The appointment of non-commissioned officers (NCOs) was carried out by the enlisted men, choosing who they felt would make the best corporals and sergeants.

[19] See: Ulster Defence Regiment Uniform, armament & equipment The first Greenfinch (female soldier) was enlisted at the battalion's Headquarters (HQ) in Armagh on 16 September 1973.

[20] At 11:30 PM on 31 May 1991, a truck loaded with 2,000 pounds (910 kg) of a new type of home made explosive was rolled (driverless) down a hill at the rear of the barracks and crashed through the perimeter fence, coming to rest against a corner of the main building.

[21][22] According to a witness, in addition to the truck, there was a Toyota Hiace van carrying at least two men acting as a support vehicle.

The first recorded use of the Provisional Irish Republican Army's Mk12 device fired horizontally was against a mobile patrol from 2 UDR on 1 March 1991.