Which revolutionary military product launch was initially met with skepticism by military leaders but later proved decisive in WWII, prompting Winston Churchill to declare it 'worth its weight in gold'?

Throughout military history, certain product launches have revolutionized warfare and changed the course of conflicts. These technological innovations represented pivotal moments where military strategy had to evolve in response to new capabilities. This poll tests your knowledge about one such groundbreaking military technology introduction that fundamentally altered battlefield dynamics and military planning.

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The M1 Garand rifle (1936)
The Radar defense network (1937-1939)
The Willys Jeep (1941)
The P-51 Mustang fighter plane (1940)