Chilling, funny, weird: I just found a WW2 poster: http://www.life.com/image/85506475/in-gallery/27932/wwii-intense-propaganda-posters
Now, guess what, it's the same poster that was used in the game: http://www.mobygames.com/game/dos/x-com-apocalypse/screenshots/gameShotId,107618/
They just added sci-fi accessories and changed the tagline. I always found the poster to be particularly intense, and now I know why. It has a little more history than I could possibly have guessed.
I always thought the 'Don't Get Hurt' advice was laughably bad.