The launch of an Atlas V carrying the NROL-34 payload has been rescheduled for April 14, 2011. This move is needed in order to allow time for the launch team to replace an avionics component on the vehicle. The launch is now scheduled for April 14 from Space Launch Complex-3 at Vandenberg Air Force Base, Calif. The opening of the launch window is 9:24 p.m. PDT.