The United Kingdom's Women's Army Auxiliary Corps (1917–1918), later named the Queen Mary's Army Auxiliary Corps (1918–1920), was the women's unit of the British Army during and immediately after the First World War. It was formally instituted on 7 July, 1917 by Sir Neville Macready, the adjutant-general, who had appointed Dr Mona Chalmers Watson the first Chief Controller and senior officer. Over 57,000 women served between January 1917 and November 1918.