Which WWII military product launch was rushed to market in 1943 with such urgency that early units were hand-delivered to combat zones before packaging standards were even established?

Throughout military history, urgent wartime needs have driven rapid product development and launches that later transformed civilian markets. From radar to jet engines, military necessity has mothered countless inventions. This poll tests your knowledge of how significant military products were launched during critical historical conflicts and how their introduction impacted battlefield outcomes. Can you identify which wartime product launch revolutionized its era?

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The Bazooka (M1 Rocket Launcher) - delivered to North African front lines in wooden crates marked only with chalk instructions
The Proximity Fuse - shipped to Pacific fleets in specialized vacuum-sealed containers with minimal labeling to maintain secrecy
The P-51D Mustang - initial units arrived at European airbases with temporary paint schemes and without standard documentation
The M1 Carbine - first batches sent to infantry units with hand-stenciled serial numbers and basic field manuals