Which top-secret military product development program was so significant that Winston Churchill referred to its team as 'the geese that laid the golden eggs but never cackled'?

Throughout history, military products have transformed warfare and shaped global events. From ancient weapons to modern technologies, product development in the military sector has been a critical aspect of national defense strategies. This trivia question focuses on a groundbreaking military product development that changed the course of WWII. Test your knowledge of how military innovation has influenced historical outcomes!

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The Manhattan Project (atomic bomb development)
Bletchley Park's codebreaking operations (including the Enigma machine decryption)
The P-51 Mustang fighter plane development program
The proximity fuse for anti-aircraft shells