Looks like an air force blank. Wood N Whimsies has a similar inlay blank but it is reversed colors. This one is not an inlay for a specific kit. It looks like a rotocrylic and the blank is solid, not for any specific kit.I suspect one of Jeff Powells Rotocrylics. Nothing looks the same on the Exotics website now, but if you have had this for a few years maybe an older pattern??
Good luck. Kind of like the armed forces designs.