Vulcan Centaur is supposed to launch more than a dozen missions for the U.S. Space Force this year, but those flights could now face months-long delays. A United Launch Alliance (ULA) Vulcan Centaur rocket successfully delivered two national security satellites to orbit earlier this month but suffered an anomaly that caused one of the boosters to emit an unusual plume of debris. Now, the U.S. Space F... [3299 chars]