CAPE CANAVERAL, Fla. (AP) — The Air Force's mystery space plane is back on Earth, following a record-breaking two-year mission. The X-37B landed at NASA's Kennedy Space Center in Florida early Sunday. The Air Force is mum about what the plane did in orbit after launching aboard a SpaceX rocket in 2017. The 780-day mission sets a new endurance record for the reusable test vehicle. It looks like a space shuttle but is one-fourth the size at 29 feet. Officials say this latest mission successfully completed its objectives. Experiments from the Air Force Research Laboratory were aboard. This was the fifth spaceflight by a vehicle of this sort. No. 6 is planned next year with another launch from Cape Canaveral. The solar-powered plane is flown by remote control without a crew.