Photos: Gantry retracted from Atlas 5

Beginning its fourth launch campaign of the year, the Atlas 5 rocket program has started stacking the vehicle that will boost a satellite 11,000 miles high for the Global Positioning System.

United Launch Alliance crews at Cape Canaveral have topped off an Atlas 5 rocket for liftoff Monday with the U.S. military’s next infrared sentinel to join a satellite fleet designed detect missile launches around the world.

The United Launch Alliance Atlas 5 rocket stands poised for flight with the Air Force’s X-37B spaceplane and a batch of CubeSats including the LightSail. The rocket was rolled to Complex 41 on Tuesday in preparation for launch on Wednesday.