Northrop Grumman tests fast-developed SMART motor, looks ahead to future applications – NASASpaceFlight.com We use cookies to ensure that we give you the best experience on our website. If you continue to use this site we will assume that you are happy with it.OkRead more Tags:AUAustraliaNgNGCNorthrop GrummanNorthrop Grumman CorporationScienceSLSsmartSMASH!22SolidSolid Rocket MotorSpaceSRB