[-)-MAILMAN-]

If you go to the skin mod folder and the aircraft in question has both a (USA) and (Multi1) folder you can put a separate skin in each of them and one skin will show when you select USAAF, USMC or USN for the air force and a different skin will show when selecting any air force other than a US air force. For the F4F-4 I have an RAF Desert skin that shows up when selecting non-US air forces and a USN/USMC skin that shows up when selecting USAAF, USMC or USN as the air force.

I am, however, having an issue when choosing RNZAF for the air force when using the F4U-1A but I started a separate post for this issue.