Helium pressurized rocket propellant and rocket fuel provides takeoff and thruster power.
Anything learned in the operation of the small scale thrusters will be incorporated into the design of the LES thruster.
P&W confirmed that if the reverse thruster had not locked properly there would have been an indicator light advising the pilots.
Propulsion methods such as the ion thruster and solar sail are examples of alternative propulsion options for spacecraft.
Bruce and I have reconfigured part of the attitude control thruster system to run off our ion drive's mercury fuel supply.