SpaceX launches Air Force's super-secret minishuttle This undated photo provided by the U.S. Air Force shows an X-37B Orbital Test Vehicle at NASA's Kennedy Space Center in Florida. An unmanned Falcon rocket that carried one of these experimental planes blasted off Thursday, Sept. 7, 2017, from Florida's Kennedy Space Center. (U.S. Air Force via AP/SpaceX via AP)
SpaceX launches Air Force's super-secret minishuttle
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SpaceX launched the Air Force's super-secret space shuttle last Thursday. It contained a technology tester. It is capable of spending years in orbit.

The unmanned Falcon rocket blasted off from Florida's Kennedy Space Center. At the same time, schools and businesses boarded up for Hurricane Irma.

It's the fifth flight for one of these crewless minishuttles. It is known as the X-37B Orbital Test Vehicle.

The two Air Force space planes have already logged a combined 5 1/2 years in orbit. But officials won't say what the spacecraft are doing up there. The last mission lasted almost two years. It ended with a May touchdown at the runway formerly used by NASA's space shuttles. The first one launched in 2010.

SpaceX landed its leftover booster back at Cape Canaveral. This was for eventual reuse. This has become customary. 

This was the first time SpaceX has provided a lift for the experimental minishuttle. The previous missions relied on United Launch Alliance's Atlas V rockets. Air Force officials said they want to use a variety of rockets for the X-37B program. This allows them to launch quickly if needed.

The Boeing-built minishuttle is 29 feet long. It has a 14-foot wingspan. By comparison, NASA's retired space shuttles were 122 feet long. They had a 78-foot wingspan.

SpaceX stopped providing details about the X-37B's climb to orbit. This happened a few minutes after liftoff. It was at the Air Force's request. The booster's return to SpaceX's landing zone at Cape Canaveral Air Force Station was broadcast live.

"The Falcon has safely landed," a SpaceX launch controller announced. Cheers erupted at SpaceX headquarters. It is in Hawthorne, California.

It was SpaceX's 16th successful return of a first-stage booster. Booster rockets are normally discarded at sea.

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