What altitude does the US military and NASA historically recognize as the beginning of space for official recognition?

Answer

50 miles (80 kilometers)

The US military and NASA utilize a lower domestic benchmark, recognizing space as beginning at 50 miles, or 80 kilometers, above sea level. This is the criterion the FAA uses for awarding commercial astronaut wings.

What altitude does the US military and NASA historically recognize as the beginning of space for official recognition?

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