3 ms·

I've read that the ability to discriminate between "vivid red" and "vivid green" is actually very important for parts of the US military... I'm not really sure

I've read that the ability to discriminate between "vivid red" and "vivid green" is actually very important for parts of the US military... I'm not really sure why though. Maybe for airborne jump signals?

TriinT 17y ago
And reading maps at night using red flashlights...