Vulcan Program’s Delay Shows US Can’t Even Copy, Much Less Replace, Russia’s Rocket Engine Know-How

A senior US Air Force official has sent defense contractors a strongly worded letter over delays to the Vulcan Centaur heavy-lift launch vehicle program – initiated to replace the workhorse Atlas V, which uses Russian-made RD-180 engines. The delay signals the US’s inability even to copy Russian-made equipment, a leading space researcher says.