OSS/London: Special Operations Branch and Secret Intelligence Branch War Diaries is a themed microfilm collection relating to US Office of Strategic Services (OSS)intelligence analyses and special operations in Western Europe, Jun 1942-Jun 1945. The collection includes Special Operations Branch organisation charts and directives, orders and summaries, Jun 1942-Jul 1944; Special Operations (SO) Branch and OSS training schedules; papers relating to Special Operations Branch liaison with Scandinavian Special Operations Executive (SOE) Section; reports on military and strategic objectives relating to Operation OVERLORD, the Allied invasion of France, Jan-Sep 1944; estimates of Special Operations personnel strength, Apr-Jun 1944; reports on resistance movements in Norway, Denmark, and Poland; summaries of Secret Intelligence Branch Operations, Apr-Sep 1944; list of decorations, commendations, and payments to families of the Special Operations and Secret Intelligence Branch casualties; biographies of Secret Intelligence personnel; reports from Secret Intelligence Branch operations in the Netherlands, France, Poland, Czechoslovakia; Germany; Secret Intelligence Branch liaison with the OSS; photographs of American and British Special Operations Branch officers; photographs of Maquis, French resistance, operatives; report from the Special Mission on German Methods of Demolition and Sabotage, Sep-Dec 1944; reports on Polish resistance fighters in France, 1944; lists of code names and code words used by the Special Operations Branch; reports from military, demolition, intelligence gathering, and espionage missions in Western Europe, 1944; after action summaries from the OSS Reports and Registry Division, London, and the OSS Reports Board, Paris, France, 1 Jan-15 Jun 1945.

Papers mainly relating to the war service of Patrick O'Regan in France and northern Italy, especially with the Special Operations Executive (SOE), 1940-1981; including papers on SOE operations in Italy with details of partisan staff, operations, equipment, enemy strength, propaganda, personal correspondence with partisans and SOE members, photographs of street fighting, mountain warfare, groups of British and Italian soldiers, victory parades, funerals, operational maps of northern Italy and south-eastern France published and produced by Michelin and the War Office, memorabilia and printed guides to Italy and the German Army, including false identity papers, 1944-1945; papers on the service of O'Regan in France and northern Italy, 1943-1945; manuscript, typescript and copy correspondence between O'Regan and his mother and others including his wife and brother, mainly relating to his service with the 186 Field Ambulance Service, Intelligence Corps and from Ceylon, preparations for a parachute drop into France, the Political Warfare Executive, training in Algiers, account by O'Regan of his experiences with partisans near Turin and other parts of northern Italy, O'Regan's post-war political views, letters to Italian partisans in the aftermath of World War Two, application to Foreign service, 1940-1952; proceedings of a conference in Bologna relating to No 1 Special force and the Italian Resistance during World War Two, 2 vols, 1981; obituaries, 1961.

Papers relating to operations of the Special Air Service (SAS) in France during World War Two and to its formation, 1944-1948; papers relating to the future role of the SAS following operations in Northern Europe, World War Two, 1945-1958; papers relating to lectures given by McLeod on the SAS, 1944-1962; maps and diagram relating to SAS operations in France, 1944.

Personal and military papers of Major General Sir Robert Edward Laycock, 1923-1968, chiefly relating to service with Special Service Brigade and as Chief of Combined Operations, 1940-1946. Includes papers on volunteering for Special Service Brigade, including completed application forms for volunteer Commando officers, 1940. Papers on Special Service Brigade training 1940-1941, including gas, bayonet and signalling training. Memoranda, reports, instructions and other papers, 1940-1942, relating to LAYFORCE (commanded by Laycock in the Middle East), including papers on the Folbot Section (later to become Special Boat Service). Papers on Special Service Brigade, [1941-1946], including memoranda, reports, minutes, papers on their reorganisation, disbandment and the future of Combined Operations, also including papers belonging to Lord George Jellicoe relating to Special Service Brigade in the Middle East; reports and other papers on Special Service Brigade operations, notably Operation TORCH, (the invasion of North West Africa, Nov 1942) and Operation HUSKY, (the invasion of Sicily, Jun 1943). Laycock's official and personal correspondence,1923-1968, chiefly relating to Special Service Brigade. Lectures and speeches to and on Special Service Brigade, chiefly by Laycock. Draft publications, scripts and press cuttings relating to Laycock and Special Service Brigade. Memoirs and accounts of Commando action, including parts of Robert Edward Laycock's memoirs and memoirs of members of 'G' Troop, 7 Commando. Papers on Laycock standing as Conservative parliamentary candidate for Bassetlaw in the 1945 general collection and on his refusal to stand for the 1947 bye-election. Papers relating to Laycock's time as Governor and Commander-in-Chief of Malta. Poems by Laycock.

Memoir of Brig Derrick Baynham, 1939-1942, including descriptions of assisting in the evacuation of Dunkirk, 1940; work in the Local Defence Volunteers, 1941; Special Operations Executive (SOE) training, including resisting interrogation and handling explosives; preparation for mission to support agents in occupied France and identify targets for sabotage; account of the mission including encounter with Milice (Vichy police), liasion with sympathetic French locals in Limoges, recovery of radio transmission equipment from the Milice, establishment of permanent base station in Perigueux and return to England, 1942. Also accounts of the attempted rescue of the surviving crew member of a crashed British bomber off the coast of Anglesey, 1941, for which Baynham was awarded the George Medal, and account of his capture by German troops and subsequent escape, Germany, April 1945.