I think they had that phrase on WWII propaganda posters as well. More to do with potential espionage of enemy countries, though.
Edit: totally wrong, it was coined on Sept 12, 2001 by New York advertising executive Allen Kay.
I think they had that phrase on WWII propaganda posters as well. More to do with potential espionage of enemy countries, though.
Edit: totally wrong, it was coined on Sept 12, 2001 by New York advertising executive Allen Kay.