Numerous variants have been produced more than the fighter’s lifespan. These have incorporated the T-45A, that's a two-seat variant also used by the US Marines, and the T-45C, an upgraded version having a glass cockpit and other augments, which currently serves being a product for T-45s still in support now. https://writeablog.net/growthselect68/5-essential-elements-for-american-fighter-jets-ww2