An unmanned mini space shuttle is on the ground at Cape Canaveral after a surprise landing.  The Air Force says the X-37B shuttle made its safe return to Kennedy Space Center Sunday after a secret, two-year mission.  The U.S. military isn't offering up many details of the mission.  

The Air Force will only say that it conducted, quote, "an experimental test program to demonstrate technologies for a reliable, reusable, unmanned space test platform."

Photo:  AOL