"Mirce models" can offer to you US insignia Paint masc for many models.

Paint masc are made from Oracal's Oramasc - foil that is designed specifically for this purpose.
In Paint masc set, I'll give 1 meter of transfer foil for easier applying on surface.

On my Meister Scale P 47 I use this paint masc too.
Shown here is how to apply it: https://i.postimg.cc/Y0pw4vjL/a31.jpg

Price for Paint masc set is 55,00$