The Vulcan had two primary versions: B.1 initial production model, featuring high altitude performance and speed and Improved B.2 with larger Wings for better lift and stability, a strengthened ...

Vulcan Materials Co. closed 22.46% short of its 52-week high of $298.31, which the company achieved on November 6th.

The first of ULA's Phase 2 missions launched last year on an Atlas V rocket, and 25 more are slated to fly on Vulcan. Pentagon officials haven't been pleased with ULA's progress on the Vulcan rocket.