An Atlas V was scheduled for launch on March 25, 2014 but it has been delayed for April due to a range instrumentation problem. This mission is carrying a clandestine payload into space for the U.S. National Reconnaissance Office. The launch is known as NROL-67.
The rocket configuration for this flight is a 541, thus it carries 4 Solid Rocket boosters.
Update: The Atlas V NROL-67 papermodel will be released on launch day in 1:144 and new 1:96 scales.