"Death Star" is honest, but I just can't see the United States deploying planet killers with a simple name like that. In the tradition of the MX Missile, maybe we would call it the Nice Station, or Peace Planetoid. Or name them after former government leaders (Cheney Class Planet Pacifiers?). How about MOARG (Mother Of All Ray Guns)?
This weapons platform is classic U.S. design. It costs an estimated $15.6 Septillion, is full of shock and awe, but can be destroyed by a single tactical fighter or tramp freighter. Plus, even when it fails they build another one.