Which famous product tagline was originally created as part of a World War II campaign to boost worker morale but wasn't commercially adopted until decades later?

Throughout history, certain brand taglines have transcended their commercial origins to become cultural touchstones. These powerful phrases not only sold products but also reflected and sometimes shaped the historical moments in which they emerged. This trivia tests your knowledge of how famous taglines intersected with significant historical events, wartime propaganda, cultural movements, and technological revolutions. Can you identify which historical context gave birth to one of marketing's most influential slogans?

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"Keep Calm and Carry On" (British Ministry of Information, later commercialized)
"Just Do It" (Nike, inspired by a WWII fighter pilot's last words)
"Think Different" (Apple, adapted from a 1940s military strategic thinking manual)
"Finger Lickin' Good" (KFC, from a mess hall slogan for soldiers' rations)