Which brand collaboration led to the development of the M&M candy, originally created specifically for soldiers in WWII because it 'melts in your mouth, not in your hands'?

Throughout military history, innovations have often come from unexpected partnerships between military departments and civilian companies. Brand collaborations have sometimes revolutionized military equipment, tactics, and ultimately the outcome of conflicts. This trivia question focuses on one of the most influential product development partnerships in 20th century military history that dramatically enhanced battlefield effectiveness.

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Mars, Inc. and the U.S. Army Quartermaster Corps
Hershey Company and the British Royal Navy
Nestlé and the German Wehrmacht
Cadbury and the Soviet Red Army