In fact, they have several good reasons given that the partnership between NASA, Orbital and Aerojet is off to such an impressive start. Two successful tests of an AJ26 engine that will power the first stage of Orbital's Taurus II rocket recently wrapped up at Stennis. The two tests were so successful that Orbital engineers decided a planned third test was unnecessary. The AJ26 engine used in the testing was removed from the E-1 stand on Jan. 24, and will be returned to Aerojet in Sacramento, Calif. to be refurbished and used on an upcoming Taurus II mission.