United Launch Alliance’s Vulcan pathfinder has rolled out to SLC-41 at Cape Canaveral for tank testing as part of a continuing campaign towards the rocket’s maiden flight. While this booster will not be the first to fly, it will have its pathfinder BE-4 engines replaced with flight engines once testing is complete in order to support a future Vulcan launch.
The booster that is taking part in this testing arrived in Florida on ULA’s RocketShip in February 2021 and was rolled to the Vertical Integration Facility (VIF), where teams stacked the vehicle on the mobile launcher, after which ULA performed preliminary testing with Vulcan, and its launch pad when they first rolled it out in March 2021.