A factory model from MD? Wow!
If it's anything like the old Polaris SLBM models I inherited from family, that plastic is gonna be hella brittle. You'd be looking at a complete strip down with repaint and new decals. And any fiddly bits like antenna or undercarriage that are glued on.....man, I don't even wanna think about it. Tricky.
Is the model of sentimental value? I would almost try to preserve it as-is, best I could, and just find the appropriate kit and decals and commission someone to do a fresh build in the markings you need. Maybe you could put the old model next to the new one in a sort of 'then & now' display.
--Chris