Photos: Atlas 5 rolls out for launch

A collection of pad photos from the United Launch Alliance Delta 4 rocket flight to deploy the NROL-45 spy satellite payload for the U.S. National Reconnaissance Office.

SpaceX is gearing up for the first commercial launch of its powerful Falcon Heavy rocket as soon as early April with a communications satellite for Arabsat, and the U.S. Air Force hopes the two side boosters from the Arabsat mission can be safely landed and reused for the military’s first Falcon Heavy mission this summer, an exercise officials said will help certify previously-flown hardware for future national security launches.

Cape Canaveral was the departure point for more space launches in 2015 than in any year since 2003, with 17 takeoffs by Atlas, Falcon and Delta rockets hoisting U.S. military satellites, commercial payloads and cargo for the International Space Station.