TOP SECRET beyond police duties it is clear that a small force of invaders could occupy any main strategic position in Iceland virtually unopposed. Such action against a signatory of the North Atlantic Treaty would provoke a world war. 4. The maintenance by sea of an isolated force against the opposition of Anglo-American Powers would be impossible. The distance from airfields in the Soviet Union or Soviet held territory is too great to permit maintenance by air with the types of transport aircraft at present in the possession of the Soviet Union, even if maintenance and refuelling facilities were available in Iceland.