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It is the second flight of the first Boeing X-37B vehicle and the third flight of the program. United States Air Force Orbital Test Vehicle is an unmanned 5000 kg, 8.8 m-long reusable mini-spaceplane capable of autonomous re-entry and landing. The specific identity of the spaceship's payload or the mission objectives were not revealed. The mission concluded after 674 days in orbit.
Limiting rule: No flight through cumulus cloud with top at or above the freezing level.
3000% cloud cover in layer above freezing (14716 ft) — approximated