Well, the answer to your question is Eaglestrike. They have a sheet out (number 48-114 I believe) that has one yellow trimmed Yorktown Panther on it. I'll try to find a web address for you in a sec. BTW- the Yorktown didn't serve in the Korean War. She was modernized and went back into service around 1954 after the war was over. The Panther on the Eaglestrike sheet served aboard the Yorktown during this time frame. Hope this helps a little.
O.K., here you go: www.aeromaster.com
go under Eaglestrike, type in the type of aircraft, the scale and nationality and it'll pullup all the Panther sheets. 48-114 is the one you want. Enjoy!