Waterside view of Delta 4 GPS 2F-6 Launch

Launching the second pair of Geosynchronous Space Situational Awareness Program satellites for the U.S. military, a United Launch Alliance Delta 4 rocket thundered away from Cape Canaveral today at 12:52 a.m. EDT (0452 GMT).

Meet the Vulcan, the next-generation rocket family brought to you by United Launch Alliance that comes with a bold reusability plan, multiple configurations for medium- to heavy-lift, all-American engines and serves as the eventual replacement for the historic Atlas and Delta rocket lines.

The USSF-106 mission will be the first launch of the Vulcan rocket once it receives certification to support missions on behalf of the U.S. Department of Defense. A launch date has not yet been announced for the third Vulcan flight.