Which of these military product innovations was originally developed for the US Army as 'Project Diana' during WWII, became crucial during Vietnam, and was marketed to civilians in the 1980s with the famous tagline 'Can you hear me now?'

Throughout military history, certain products have revolutionized warfare and shaped the outcome of conflicts. This poll tests your knowledge about one of the most significant military product developments of the 20th century - a piece of equipment that transformed battlefield communications and strategy implementation. Consider how military innovations often begin as specialized tools before sometimes finding their way into civilian applications.

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GPS (Global Positioning System)
Walkie-Talkie radio communications
Night vision goggles
Kevlar body armor