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.

Photocopies of extracts from MacDermott's autobiography, 'An enriching life', privately printed in 1979, primarily concerning the death of his brother in France, Jan 1916, MacDermott's work in shell shop at Harland and Wolff Ltd, 1916, his experience of the Easter Rising, Dublin, Apr 1916, his military training in Belfast and the UK, 1916-1917, his service in France, Belgium and Germany, including the Battle of the Lys, Apr 1918, and the second Battle of the Marne, Jul-Aug 1918, his legal training, 1919-1921, and his reading of FM Sir Henry Wilson...his life and diaries by Sir Charles Edward Callwell (Cassell and Co, London, 1927) and Revolt in the Desert by Thomas Edward Lawrence (later Shaw) (Jonathon Cape, London, 1927) and also including a tribute by to MacDermott Lord Robert Lynd Erskine Lowry, Baron Lowry, Lord Chief Justice of Northern Ireland.