Photos: Atlas 5 rocket on the pad with WorldView 4 satellite

A United Launch Alliance Delta 4 rocket will deliver the U.S. Air Force’s second GPS 3-series navigation satellite into an elliptical transfer orbit nearly two hours after liftoff from Cape Canaveral.

An Atlas 5 rocket carrying a classified national security satellite was rolled to the launch pad this morning for Thursday’s flight to bolster the U.S. intelligence-gathering space architecture.

The final year of launches in the current breed of Global Positioning System navigation satellites kicks off Wednesday afternoon aboard a Delta 4 rocket from Cape Canaveral.