Do You Realise .. That the Enemy Would Like to Know What You Know

image: at the top an owl perches on a branch against a full moon and stares out of the poster; at the bottom is a waste paper basket, in which are visible documents; the colour scheme is generally blue, except for a trace of red in the owl; behind the basket is a red stripe, upturned and tapering at both ends; the text is in red and blue, the final line curving upwards at either end. text: DO YOU REALISE.. THAT THE ENEMY would like to know what YOU KNOW Take no risks - keep quiet Don't hand out those scraps of information which he needs, and which are often left in WASTE PAPER BASKETS