Which World War II product marketing campaign was created by the U.S. military specifically to hide the real purpose of radar technology from the enemy?

Throughout military history, psychological operations (PSYOP) have served as sophisticated marketing campaigns to influence enemy morale, civilian populations, and sometimes even recruitment efforts. From leaflet drops to radio broadcasts, militaries worldwide have employed various marketing tactics to achieve strategic objectives. Test your knowledge about these historical military marketing campaigns that shaped conflicts and public perception.

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The 'Carrots Improve Night Vision' campaign, suggesting British pilots ate carrots to see German bombers at night
The 'Buy War Bonds' campaign, which secretly contained coded messages for spies in posters
The 'Loose Lips Sink Ships' campaign, which was actually designed to cover up sonar development
The 'Rosie the Riveter' campaign, initially created to disguise factory production of radar components