Which famous commercial product was originally developed as a waterproof grease for military equipment during WWII but was later marketed to consumers after soldiers discovered its versatility?

Many everyday products we use began as military innovations before transitioning to civilian markets. The defense industry has historically been a powerful driver of product development, with technologies originally designed for warfare later adapted for commercial use. This fascinating crossover between military necessity and consumer convenience has shaped product development strategies across industries. Test your knowledge about these battlefield-to-retail-shelf transitions!

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WD-40
Duct Tape
Silly Putty
Chapstick