Mum's the word: The U.S. Air Force's secretive X-37B space plane has winged its way past the 200 day mark, carrying out a classified agenda for the American military.
The unmanned X-37B space plane rocketed into orbit on May 20 on a United Launch Alliance Atlas V rocket launching from Florida's Cape Canaveral Air Force Station back. The reusable robotic space plane mission, also dubbed OTV-4 (short for Orbital Test Vehicle-4), is the fourth spacecraft of its kind for the U.S. Air Force.
OTV-4 also marks the second flight of the second X-37B vehicle built for the Air Force by Boeing Space & Intelligence Systems. Only two reusable X-37B vehicles have been confirmed as constituting the fleet.
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