ULA's Big Rocket Delay Causes Space Force to Wait and See.

United Launch Alliance (ULA) has delayed the inaugural flight of its Vulcan rocket until the summer following an explosion during testing at NASA's Marshall Space Flight Center in Alabama. The rocket was being prepped for its first flight, scheduled for May 4, and was set to deliver Astrobotic's Peregrine lunar lander and the first two Amazon Kuiper internet satellites. The fully expendable rocket has been in development since 2014 and is designed to replace ULA's Atlas V and Delta IV rockets.