Which company developed Kevlar, the synthetic fiber used in modern military body armor, and in what decade was it first invented?

Military history is filled with groundbreaking product developments that later transformed civilian life. One of the most significant protective innovations of the 20th century emerged from a need to better shield soldiers in combat. This trivia question explores the product development history behind a material that has saved countless military and law enforcement lives since its introduction.

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DuPont in the 1960s
3M in the 1970s
Raytheon in the 1950s
General Dynamics in the 1980s