The Corsair Mark I was meant to be the Royal Navy version (why on earth we got that version rather than the F4U-1 USN version is beyond me) so the US markings are the default rather than painted on that MOST US aircraft have.
The markings themselves, as of 4.10.1, are much better looking and they change depending on the mission date. Not the map date (that's irrelevant to this feature to the best of my knowledge). Change the mission date.
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