Stumbled across this pic, the caption reads:
The Navy had a funny tradition – every time a plane would land on the wrong carrier, it would be covered with graffiti before being returned. There’s also a historical rivalry between the branches of the military, hence the “Must be Air Force” slogan. Moments of levity like this were important to break up the monotony of life in the military, and also to raise morale during a dark and frightening time.
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