Several variants are already produced around the fighter’s lifespan. These have incorporated the T-45A, that's a two-seat variant also employed by the US Marines, plus the T-45C, an upgraded Edition by using a glass cockpit and other augments, which currently serves like a design for T-45s still in company these https://www.murakamilab.tuis.ac.jp/wiki/index.php?patiocrown26