The Taurus launch vehicle, later renamed Minotaur-C (for "Minotaur-Commercial"), was the first of the Minotaur vehicle family, and the first ground-launched orbital booster developed by Orbital Sciences Corporation (OSC), derived by adding a solid booster stage to the air-launched Pegasus rocket. The first flight, sponsored by DARPA, was in 1994. After a series of failures between 2001 and 2011, the launch vehicle was rebranded as Minotaur-C in 2014. Due to laws against selling government equipment, the Minotaur-C is the only available Minotaur launch vehicle for commercial launches.