More than anything, US camouflage painting showed who ruled the skies over Europe from pretty much early 1944 onwards: The USAAF. Because with only that type of superiority could the USAAF afford to paint its aircraft that they would be prominently seen (and hence provoke the enemy to engage with them) rather than hidden from view. It was a real psychological show of confidence: "Nobody flies higher than us and our airfields don't get bombed either." And the D-Day zebra-look (adapted to prevent friendly fire and collateral damage by making allied planes readily recognizable to Allied forces) even topped that. Once you are more concerned about friendly fire casualities than about what your enemy can do to you, you're getting there.