Here's a skin from the 442d Fighter Wing for the A-10C (works on the A model) and another for the A-10C II.
*Please delete the older versions*
Obs.: Just the number "1" is static on the skins so you can change the number code for a unit dynamically ingame. I've used the same workaround ED uses for code numbers with more than two characters. The "123" is just a reference number. Ingame you will see the "static 1" followed by two 00 (number 100) that you can change for the number you want.