ULA rocket launch out of Vandenberg scrubbed again, reset for Dec. 20

United Launch Alliance for the second time this week has pulled back from the launch pad at Vandenberg Air Force Base, this time just minutes before liftoff.
The conglomerate of Lockheed Martin and Boeing set a new launch window to put a next generation spy satellite into orbit at 5:31 p.m. Thursday, Dec. 20.
An exact reason for the most recent delay was not given. The original launch was scheduled for Friday, Dec. 7, which was delayed until the following Saturday, only to be put off again for a