"United Launch Alliance's Vulcan Centaur Debut Faces Delay"
United Launch Alliance is delaying the maiden launch of its Vulcan Centaur rocket due to an anomaly investigation into the Centaur V upper stage. The investigation found that minor reinforcements are needed for the Centaur's thin-walled pressure stabilized tanks. The rocket's first stage performed well during testing, but United Launch Alliance wants to address potential issues on the ground before flight. The delay may result in national security payloads being switched to SpaceX's Falcon 9 or Falcon Heavy. The fix is expected to be relatively easy, and the launch could still happen this year.