I was in a Navy adversary squadron with F-5s and the paint shop put a robin’s egg blue camouflage paint scheme on one of the aircraft. It was like a cloaking device. It would dissapear from view well inside 3/4s of a mile. You would be looking right at it and then “poof” it was gone.
Points out the “problem” with assumptions about how easy it is to shoot down A-10’s above a battlefield “manually” by shoulder-fired missiles.
Can be done of course, but not easily.
From a submarine periscope, looking against the horizon, it is very, very easy to see ships with their current paint schemes. That needs to be changed - for merchants and for USN ships.