THIS DOCUMENT IS THE PROPERTY OF HIS BRITANNIC MAJESTY'S GOVERNMENT TO BE KEPT UNDER LOCK AND KEY. It is requested that special care may be taken to ensure the secrecy of this document. S E C R E T. J.I.C.(40)246 (Revise). COPY NO. 25 27TH AUGUST, 1940. P.R.(40)19(Revise). WAR CABINET. JOINT INTELLIGENCE SUB-COMMITTEE. PLANS TO MYSTIFY AND MISLEAD THE ENEMY. Memorandum by the Inter-Services Security Board. As a result of various Papers issued on the subject, there is in our minds some confusion of thought as to the correct procedure for the submission of suggestions of a military nature intended to mystify and mislead the enemy.