MonopropellantNorthrop Grumman has developed, qualified and flown spacecraft monopropellant thrusters for on-orbit delta velocity and attitude control for a variety of spacecraft for more than 25 years. Our family of catalytic monopropellant hydrazine thrusters range in size from 0.1 lbf thrust to 15 lbf thrust. These thrusters all share the unique Northrop Grumman head space design, utilize Shell 405 catalyst, and incorporate bed loadings consistent with long life. For robustness and maximum user flexibility, all thrusters are qualified with monopropellant grade hydrazine. We recently requalified our 0.2 lbf thruster for the long-life Chandra X-ray Observatory mission.