 Flight testing of NOFBX engines had been planned on the International Space Station, but, in the event, did not go forward.NOFBX had previously been used to fuel a reciprocating engine to power high-altitude, long-endurance drone aircraft under a DARPA contract.NOFBX was promoted by the company at the time as a "game changing" technology with the several characteristics that underline why safer monopropellants were of interest in the industry