Which famous candy was included in WWII military rations and featured a special coating specifically designed to prevent melting in soldiers' hands?

During World War II, some of today's most recognizable consumer brands played surprising roles in military efforts. Product innovations developed for soldiers often found their way into civilian markets after the war. This trivia question explores how one famous candy brand's marketing strategy was directly influenced by battlefield needs, creating a product feature that remains iconic today.

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M&M's
Hershey's Chocolate Bar
Life Savers
Tootsie Rolls