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ABBREVIATIONS USED IN THESE VOLUMES
| S.S. = | Secret Service. |
| S.S.F.A. = | Soldiers' and Sailors' Families Association (British). |
| S.S.S.E. = | Société Suisse de Surveillance Économique = Swiss Society for Economic Supervision. |
| Staffs. = | Staffordshire. |
| Stellv. = | Stellvertreter, stellvertretend = Substitute, acting deputy (German Army). |
| Suff. = | Suffolk. |
| Sur. = | Surrey. |
| Sus. = | Sussex. |
| T | |
| T. = | Territorial (British Army) |
| T. = | Time (fuze). |
| T.A. = | Territorial Army (British, since 1919). |
| T.B.D. = | Torpedo-boat destroyer. |
| T.C. = | Trains de Combat = "Combat trains," "first-line transport" (French). |
| T.D. = | Territorial Officers' Decoration (British). |
| Tenn. = | Tennessee. |
| Tex. = | Texas. |
| T.F. = | Territorial Force (British, till 1919). |
| T.F.N.S. = | Territorial Force Nursing Society (British). |
| T.M. = | Trench Mortar. |
| T.M.G. = | Temps Moyen de Greenwich = Greenwich Mean Time (French). |
| T.N.T. = | Trinitrotoluene (High Explosive). |
| T.P.S. = | Télégraphie par le Sol = Earth telegraphy (Power buzzer, etc.) (French). |
| T.S.F. = | Télégraphie sans fil = Wireless telegraphy (French). |
| U | |
| Ukr. = | Ukraine. |
| U.S. = | United States. |
| U.S.A. = | United States of America; United States Army. |
| U.S.N. = | United States Navy. |
| U.S.S. = | United States Ship. |
| V | |
| Va. = | Virginia. |
| V.A.D. = | Voluntary Aid Detachment; nursing service, Territorial Force (British). |
| V.C. = | Victoria Cross (British). |
| V.D. = | Volunteer Officers' Decoration (British). |
| Verst. = | Verstärkt = Reinforced, chiefly of formations temporarily provided with artillery (German). |
| viz. = | videlicet = namely. |
| Vt. = | Vermont. |
| V.T.C. = | Volunteer Training Corps (British). |
| W | |
| W. = | West. |
| W.A.A.C. = | Women's Army Auxiliary Corps (Q.M.A.A.C.) (British). |
| W.A.F.F. = | West Africa Frontier Force. |
| Wash. = | Washington. |
| W.D. = | War Department (British and U.S.A.). |
| Westm. = | Westmorland. |
| WUts. = | Wiltshire. |
| Wis. = | Wisconsin. |
| WM. = | Werfmine = Shell of Minenwerfer (German). |
| W.O. = | War Office (British Gov't.). |
| Worcs. = | Worcestershire. |
| W.R.A.C. = | Women's Reserve Ambulance Corps (British). |
| W.R.A.F. = | Women's Royal Air Force (British). |
| W.R.N.S. = | Women's Royal Naval Service (British). |
| W.S.P.U. = | Women's Social and Political Union (British). |
| Wumba. = | Waffen- und Munitions-Beschaffungs-Amt = War Office for Munitions (German). |
| W.U.S.L. = | Women's United Service League (British). |
| W.Va. = | West Virginia. |
| W.V.R. = | Women's Volunteer Service. |
| Wyo. = | Wyoming. |
| Y | |
| yd. = | yard or yards. |
| Y.M.C.A. = | Young Men's Christian Association. |
| Yorks. = | Yorkshire. |
| Y.W.C.A. = | Young Women's Christian Association. |
