The Associate Press release August 28, 2013
'The Delta Heavy IV rocket carrying a satellite for the National Reconnaissance Office, which oversees the nation’s constellation of intelligence-gathering satellites; lifted off at 11:03 a.m. PDT, about 10 minutes later than planned as engineers dealt with some last-minute minor issues.'
Since it is a classified mission, there are no details available for release.
The Delta Heavy IV is the largest, heaviest rocket in the US and the tallest ever to launch from Vandenberg AFB. The base is 9.2 miles north of Lompoc, California and 50 miles north of Santa Barbara.
The last time this rocket launched from the AFB in 2011, the noise was heard in Santa Barbara. This time a new three timed sequence of 2 seconds of interval between ignitions of each of the three engines made it less of an impact at liftoff.
The Delta Heavy IV rocket is part of the United Launch Alliance program is a joint venture with Lockheed Martin Corp. and the Boeing Co. to provide space launch services to the federal government with their delta and atlas rocket programs.
Read more here:
Launch Alliance's website at http://www.ulalaunch.com