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 Lieutenant) October 25, 2014

A Careless talk poster, illustrated with civilian and armed forces headgear, with the slogan 'The more information you keep under your hat' (trilby hat) and the caption 'the safer he'll be under his' (steel helmet). This slogan is less succinct, although more explicit, than the wide-ranging campaign 'Keep it Under Your Hat' of 1940, of which this poster may have intended to be part.

Source: 

National Archives - http://forces.tv
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