ULA delays further use of enhanced upper-stage engine pending studies

With ULA’s new rocket Vulcan behind schedule, Space Force agrees to let Atlas 5 fill in. Switching vehicles financially penalizes ULA. According to the company, the Atlas 5 is more expensive than Vulcan. Phase 2 provisions allow ULA to change vehicles but at no cost penalty to the government.

ULA launch now on Tuesday

NASA adds ULA's Vulcan Centaur rocket to launch lineup for future missions