As Longeron stated, I have flown in 3 ejection seat armed aircraft flights and the double visor stayed down and mask stayed on all the time as I was a cat B pax, bar one time on my last Jag flight, the dark visor came up for the selfie to prove I was in the seat! I know certain Jag pilots did remove masks for comfort (amazingly one civvy LAE said to me "I thought military combat aircraft were unpressurised?" which I replied that they are, just not to the pressure diff of civil aircraft) at suitable cabin diffs and the odd cool photo, if you were T E with demon gezzer shades on.!