A file of signals intelligence reports, messages, and correspondence issued by the Government Code and Cypher School and sent by the head ('C') of the Secret Intelligence Service (MI6) to the Prime Minister, Winston Churchill. This file includes the following reports: that the German Africa Corps' headquarters are located in Derna, on May 16, with consideration being given to setting up a naval battle HQ there; on an air transport schedule for military draft personnel for Africa, on May 15; a German naval report for all areas, on May 19; and a German assessment of British reinforcements that have arrived and that are expected in the Middle East, on May 16.