Which innovative emergency ration product was specifically developed for U.S. troops during WWII and nicknamed after its distinctive shape?

During World War II, military product development was critical for sustaining troops in combat zones. One particular food product innovation became famous for its practicality, nutritional value, and distinctive packaging. This product represented a revolutionary approach to field rations and influenced military supply strategy for decades to come. Test your knowledge about this significant military consumer product that changed how armies approached field nutrition.

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D-ration chocolate bar (aka 'Hitler's Secret Weapon')
K-ration meal kit
Hershey's Tropical Chocolate Bar
Logan Bar (aka 'Logan's Brick')