Quite a few variants are actually generated over the fighter’s lifespan. These have included the T-45A, that's a two-seat variant also utilized by the US Marines, as well as the T-45C, an upgraded Model that has a glass cockpit and other augments, which currently serves being a design for T-45s https://www.metooo.es/u/66ea8b9b129f1459ee6c5d05