All I know that Captain Kenneth A. Walsh was fly F4U-4 BuNo 80879 and his 21st kill was on June 25. 1945, he shot down a kamikaze over northern Okinawa whilst serving with VMF-222.
Some US Navy pilots like Lcdr. Tommy Blackburn, also flow an F4U-4 and he was first to landing on USS Midway Carrier with his F4U-4.
Also, Major Gregory Boyington flow F4U-4, but he discharge later.