When did the US military start using night vision?

The US military started its research on night vision in the late 1940s by establishing a night vision technology development program. Since then, they have started developing various night vision technologies. By the end of the 1950s, they developed viable infrared viewing systems. Now there has been far more significant development in this field. Night vision technology equipment has reached a level of generation 4 now, which is highly advanced.

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