ULA's Vulcan rocket inches closer to launch with dress rehearsal and Amazon partnership.

United Launch Alliance (ULA) plans to resume tanking tests and test fire the main engines of its Vulcan Centaur rocket as early as next week, despite an ongoing investigation into a Centaur upper-stage testing anomaly that occurred on March 29. ULA has not provided a new target launch date for Vulcan, but with success in the upcoming tests and a resolution of the Centaur V ground test anomaly, the company is projecting for a Vulcan Cert-1 launch this summer. The debut launch will carry Astrobotic’s Peregrine lunar lander, two demonstration satellites for Amazon’s Project Kuiper broadband constellation, and a payload for space memorial company Celestis.