[jonhendry18]

And depending on the length of shifts on a ship, blue light might be useful in promoting alertness.

(Probably would be useful on a plane or helicopter, too, but would be balanced out by other concerns.)

[NeedMoreTea]

Quite. If you're in a sub or control room you don't need night vision. If you're in a situation of needing both colour appropriately.

In a plane keeping priority on what's outside is needed - if you're flying visually. If you're instrument flying quite the opposite.