[momofsixgirls]

I think it had something to do with D-Day, anyone want to make sure I am right about that?

[smokeyjon]

Ah, I love the internet:

"John has a long mustache" was the coded-signal used by the French Resistance in WWII to mobilize their forces once the Allies had landed on the Normandy beaches.

[JimNtexas]

"I think it had something to do with D-Day, anyone want to make sure I am right about that?"

In WWII, the BBC broadcast "personal messages" on their shortwaver broadcasting service. These messages were coded instructions to resistance groups in Europe.

The message "John has a long mustache" was the code that told the French resistance that the D-Day invasion was about to start. It was made famous by the movie 'The Longest Day'.