[1] The goal of the development was to produce a large, low-cost, easy-to-manufacture booster engine.

Test results demonstrated that the engine was stable over a wide variety of thrust levels and propellant ratios.

[1] Development of the engine was temporarily discontinued with the cancellation of the Space Launch Initiative.

[1] In 2002 TRW was acquired by Northrop Grumman and development of a LOX/RP-1 engine (TR-107) continued, under contract to NASA, for potential use on next-generation launch and space transportation vehicles.

In 2002, Elon Musk asked Mueller to join him as a founding member of SpaceX.