Doolittle, the game has textures for early war and late war. It's possible to have a skin with a black texture for the early war and a grey texture for the late war. The game determines which texture to use based on the date. Syxx_Killer has done the same thing that we did with some of the newer killflags skins, that is, use black for early and grey for late.
It's magic
And you don't need any other mods for it to work.