1940s propaganda posters warned that these might sink ships

Below you may find the 1940s propaganda posters warned that these might sink ships which is part of the Jeopardy Archive. In case the question or answer is wrong or something is missing do not hesitate to contact us and we will be glad to help you out. If you are looking for our Jeopardy Finder you can access it here.

QUESTION: 1940s propaganda posters warned that these might sink ships
ANSWER: LOOSE LIPS

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