I'm in Okinawa. I can guarantee this space plane never landed at Kadena AB. Such an event would be noticed immediately by the Okinawan base-watchers, who can see all of the runway and flightline area from hills outside the base.
... And Hurlburt Field's runway is too short and it's entire length is clearly visable from a 4-lane US Highway 98. Not the place you'd want something "secret" to land on.
-Traveler
And I never saw either of the SR-71's that weren't there in 67 take off at night.