Which of these famous commercial products was originally developed specifically for U.S. soldiers during World War II but became a massive retail success after the war?

Throughout history, certain commercial products originally developed for military use have transformed warfare and later found their way into civilian markets. Others began as civilian innovations before being adapted for military applications. This poll tests your knowledge of these crossover products that played significant roles in military history while becoming retail successes.

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Aerosol spray cans (bug spray)
M&M's chocolate candies
Zippo lighters
Ray-Ban Aviator sunglasses