Which famous retail promotion was created in 1942 to boost morale and commemorate American military service, becoming one of the most collectible military-related retail items of the 20th century?

During World War II, retail strategies underwent dramatic transformations as companies balanced patriotism with profit. Many brands found creative ways to maintain visibility while supporting the war effort through special promotions, military-themed advertising, and product modifications. This trivia question explores one of the most successful retail promotional campaigns that emerged from this turbulent period and continues to influence military collectibles markets to this day.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Coca-Cola's 'V for Victory' bottle caps
Zippo's 'War Series' lighters with military branch engravings
Hershey's 'Ration D' chocolate bar collector cards
Campbell's 'Stars of Service' soup can labels