SpaceX
In May 2013, SpaceX announced that they had signed a three-year lease for land and facilities at Spaceport America in order to support high-altitude, high-velocity flight testing of the Grasshopper v1.1 reusable launch vehicle (RLV), the second-generation of the SpaceX experimental vertical takeoff, vertical landing suborbital technology-demonstrator. SpaceX is using Grasshopper as one-element of a multi-element program to develop reusable boosters and second stages. Prior to May, SpaceX had indicated that they would do these tests at US Government's adjacent White Sands Missile Range facility.
Read more about this topic: Spaceport America, Operation