Many variants are already produced more than the fighter’s lifespan. These have involved the T-45A, and that is a two-seat variant also utilized by the US Marines, as well as T-45C, an upgraded Edition by using a glass cockpit and other augments, which currently serves like a design for T-45s https://lhcathome.cern.ch/lhcathome/show_user.php?userid=1942698