1893 Apr 19 Born Yorks
1911 census in Hull
1911 Mar 30. Enlists in ASC Territorial. Service on web
1914 Aug 5 Embodied
1914 Oct 31. Promoted Sgt
1915 Apr 16. Posted to France
1916 Jan 1. MID
1917 Jan 17 Posted back to UK
1917 Jun 27 Commissioned. The undermentioned cadets to be temp,, 2nd Lts. (attd.). William John Cooper, Yorks. Regt
1918 Dec 27 York. Reg. The undermentioned temp. 2nd Lts. to be temp. Lts.: — W. J. Cooper, with precedence next above L. F. Simpson, M.C.
1921 Sep 1. The undermentioned, relinquish their commissions on completion of service: — Green Howards. Temp. Lts., and retain the rank of Lt.: — W. J. Cooper.
1921 Dec 5 Joined ADRIC with service no 2211. Posted to A Coy
1922 Jan He appears to be still serving on demobilisation of ADRIC
1939 Register. He is a Secretary/Chauffeur living at 16 , Southgate M.B., Middlesex, Single