1. O' Rorke, F.C. Major · Royal Army Veterinary Corps
2. O'Brien, A.S.N (?); A.S.H (?) 2nd Lt. · Royal Field Artillery
3. O'Brien (Hon.), Henry Barnaby † 1969 Lt. · 1 Irish Guards
4. O'Connor, G.J (?) 2nd Lt. · 6 D.A.C. M.T.
5. O'Hanlon, Geoffrey † 1975 Capt. · 6 Dorsetshire Regiment, 17 Division
6. Oakes, Albert Pemberton † 1919 Gunner · 2 Canadian Garrison Artillery Etaples Military Cemetery, LXXII. D. 28.
7. Oakes, Gerard Edmund Rosingrave † 1918 2nd Lt. · 1 West Yorkshire Regiment Brandhoek New Military Cemetery No.3 (Belgium), II.O.13; personal inscription: VITAI LAMPADA
8. Ockford, William Ernest John † 1918 Pte. · 2 Devonshire Regiment Soissons Memorial
9. Oddy, Horace 14 (?) Motor Machine Gun Service
10. Officer, Alec Lt.
11. Officer, Keith Frank † 1969 Major · Deputy Assistant Quartermaster-General, 2 Division (July 1916); Deputy Assistant Adjutant-General, I Anzac Corps (July 1917)
12. Offlow, Arthur Bleasdale Bombardier · 46 Royal Garrison Artillery
13. Ogborn, Douglas Frederick † 1926
14. Ogden, R. R.F.A.
15. Ogden, William ("Bill") † 1918 L/Cpl. · 26 Field Ambulance, Royal Army Medical Corps St. Sever Cemetery Extension, Rouen, P. VI. N. 1B.
16. Ogilvie, Edgar George Sapper · Royal Engineers Signals
17. Ogle, Edmund Chalenor Major · 11 King's Regiment (Liverpool)
18. Ogle-Skan, H.W. Lt. · Royal Army Medical Corps 66 Heavy Artillery Group
19. Okell, George 2nd Lt. · 15 Welsh Regiment
20. Oldchurch (?), C.G. 2nd Lt. · 1 King's Shropshire Light Infantry
21. Oliver, S.R. Sapper · Royal Engineers Signals, 118 Brigade
22. Oliver, Lionel Grant † 1936 Col. · 13 Middlesex Regiment
23. Oliver, William Gunner · 88 Siege Battery, Royal Garrison Artillery
24. Ollivant, A.H. Brig.-Gen. · Royal Artillery
25. Omsee (?), R.M (?).; R.W (?). Lt.

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