DRAFT 1. The Joint Intelligence Sub-Committee has received a request from the U.S. Chief of Naval Operations that a topographical survey of portions of the United Kingdom be carried out. 2. The American requirement is worded as follows:"Assuming that the British Isles were invaded by a power hostile to the U.S. and it became necessary to conduct amphibious operations in order to wrest it from enemy hands, detailed information would be needed about the most favourable invasion points. Provided it is agreed that the most probable invasions targets for U.S.