Personal Number: 121348 Rank: Captain Name: Murrough Richard O'BRIEN Unit: Irish Guards London Gazette : 5 March 1940 https://www.thegazette.co.uk/London/issue/34804/supplement/1307/data.pdf The undermentioned Cadets (Officer Cadet Training .Unit, Sandhurst) to be 2nd Lts. 25th Feb. 1940: — FOOT GUARDS. Ir. G'ds. Murrough Richard O'BRIEN (121348), from R. Fus. London Gazette : 15 June 1945 https://www.thegazette.co.uk/London/issue/37130/supplement/3119/data.pdf I. G'ds. War Subs. Capt. M. R. O'BRIEN {121348) relinquishes his commn. on account of disability, 13th June 1945, and is granted the hon. rank of Maj.