United Launch Alliance oversaw the completion of a critical milestone in mid-April on the road to resuming flights with its Vulcan rockets.
On April 15, the company said Northrop Grumman performed a successful static fire test of a Graphite Epoxy Motor (GEM) 63XL Solid Rocket Booster (SRB).
A spokesperson told Spaceflight Now on Thursday that the test served to "demonstrate nozzle design enhancements which were already in work and an advanced propellant technology for future solid rocket motors across their portfolio.
