After orbiting the Earth for more than 14 months on a top-secret mission, an experimental space drone landed Saturday on an airstrip at Vandenberg Air Force Base northwest of Santa Barbara.

Air Force officials offered few details about the mission, saying that the space plane simply provided a way to test new technologies in space, such as satellite sensors and other components.

The pilotless X-37B Orbital Test Vehicle, which looks like a miniature version of the space shuttle, touched down at 5:48 a.m. PDT, Vandenberg officials confirmed. When it was launched from Cape Canaveral, Fla., in March 2011, it garnered international attention.

"Team Vandenberg has put in over a year's worth of hard work in preparation for this landing and today we were able to see the fruits of our labor," Col. Nina Armagno, space wing commander at Vandenberg, said in a statement. "I am so proud of our team for coming together to execute this landing operation safely and successfully."

The drone was initially slated to return Nov. 30, 2011, but the mission was extended.

Although the X-37B program is "classified," some of the particulars are known. More than 10 years ago, it began as a NASA program to test new technologies for the space shuttle. But when the government decided to retire the aging fleet of shuttles, the Pentagon took over the program and cloaked it in secrecy.