During the Second World War, many women from Ulster enlisted in the ranks of the Auxiliary Territorial Service or A.T.S. the women's branch of the British Army.
Members of the Auxiliary Territorial Service record the results of a firing test at 17th Anti-Aircraft Practise Camp, Ballykinlar, Co. Down on 11th March 1941.
On 24th September 1941, members of the Auxiliary Territorial Service visited an Anti-Aircraft Battery in Northern Ireland to see how their work contributed.
On 26th September 1941, members of No. 10 Motor Transport Company, Auxiliary Territorial Service demonstrated their use of motorcycles and vehicle maintenance.
On 9th January 1942, members of the British Army and Auxiliary Territorial Service attended an Army Dental Centre on the Antrim Road in Belfast for treatment.
Members of the Auxiliary Territorial Service greet soldiers of 34th (Red Bull) Infantry Division in Whitla Street, Belfast on 26th January 1942.
Her Royal Highness The Princess Royal visited Palace Barracks, Holywood on 14th October 1942 where she inspected members of the Auxiliary Territorial Service.
On 16th October 1942, Her Royal Highness The Princess Royal inspected members of the Auxiliary Territorial Service during her short royal visit to Northern Ireland.
A detachment of the Auxiliary Territorial Service at the unveiling of a commemorative stone marking the first anniversary of the official arrival of U.S. troops to Northern Ireland.
On 4th February 1943, Lieutenant J.R. Bainbridge accompanied members of No. 12 and 33 Provost Company, A.T.S. in Northern Ireland showing their daily activities.
Members of the Auxiliary Territorial Service march past the saluting base during a commemorative event to mark the 25th anniversary of the establishment of the Red Army on 20th February 1943.
On 26th September 1943, a detachment of the Auxiliary Territorial Service marched past City Hall in Belfast as part of a Battle of Britain commemoration parade.
In 1941, Sergeant Staff Major Mabel Kathleen Twist of Belfast was named by Chief Controller Jean Knox as "the smartest woman in the A.T.S."