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Poster message: Careless talk ruins lives

Illustration: Red stop sign with word "Confidential" on it or maybe stylized person's face or form with finger to lips, Shhhhhh! Or something ("We keep it...

Because you have a lot to say (and that would terribly clutter up your poster), I would design a simple, eye-catching poster with a very short, hard-hitting message on it (a "loose lips sink ships"...

A poster is usually large (maybe 3'x4'), simple, and uncluttered with bold print and one major illustration. Is that what you have in mind?