A number of variants are already produced in excess of the fighter’s lifespan. These have included the T-45A, that's a two-seat variant also employed by the US Marines, and also the T-45C, an upgraded version using a glass cockpit and other augments, which currently serves to be a model for https://www.saludcapital.gov.co/sitios/VigilanciaSaludPublica/Lists/Contactenos/DispForm.aspx?ID=756292