ANNEX COPY TELEGRAM IMMEDIATE From: Air Ministry TO: Britman Washington CZ555 23/6/42. Following from Chiefs of Staff No. (W) 208. We have been considering the classification of secret documents (C.O.S.(42)288 despatched to you by air 19th June refers). 2. The British and American classifications are not parallel nor has the treatment of such documents been the same in the three British Services. We have now agreed that our categories should be:"Most Secret" "Secret" "Confidential", to include "Security" "Restricted", to take the place of "Official use only", and "Not to be published".