In 2001, Aerojet Redmond Rocket Center was competitively selected to design a 50 kW Hall thruster as a complementary effort to NASA GRC’s in-house development of the NASA-457M thruster. A contract option for thruster fabrication was exercised and the thruster was delivering to NASA GRC in 2002 and tested in 2003. In FY04, the high-power Hall thruster development funded by the ISTP was refocused on the GRC developed, NASA-457M, 50 kW Hall thruster.