Which innovative military technology was first mass-produced and marketed to Allied forces in 1942 with the advertising slogan "The Flying Can Opener"?

Throughout history, military technology has evolved through groundbreaking product launches that forever changed warfare. Some introductions were met with skepticism, while others were immediately recognized as revolutionary. This poll tests your knowledge of how one particularly significant weapon system was first introduced to the battlefield and marketed to military leadership - a product launch that changed the course of military history.

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P-47 Thunderbolt fighter aircraft
M4 Sherman tank
Bazooka anti-tank weapon
Liberty ship cargo vessel