Which famous consumer product was originally created by the Mars Company during WWII specifically for soldiers because it "wouldn't melt in their hands"?

Throughout military history, certain products have transformed warfare in unexpected ways. Sometimes these innovations came from surprising sources or were developed for entirely different purposes before being adapted for military use. This trivia question explores one such famous product that had a significant impact on military tactics and operations during a pivotal period in history.

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M&M's
Hershey's Tropical Chocolate Bar
Kit Kat
Tootsie Roll