Delta IV Heavy Launch Scrubbed by ULA from Cape Canaveral.

The Delta IV Heavy rocket, a workhorse for the Department of Defense and critical national security assets, is set to launch one more surveillance satellite into orbit from Cape Canaveral Space Force Station's launch complex 37. The Delta family of rockets is phasing out, with the very last Delta IV Heavy mission scheduled for next year. After that, big and heavy payloads will rely on SpaceX's Falcon Heavy. ULA is also working on getting the new rocket Vulcan Centaur off the ground for its first mission this summer.