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The USSR copied the US's reusable Space Shuttle orbiter, which they called "Buran"-class orbiter or simply "Buran", which was designed to be launched into orbit by the expendable Energia rocket, and capable of robotic orbital flight and landing. Unlike the Space Shuttle, "Buran" had no main rocket engines, but like the Space Shuttle orbiter it used smaller rocket engines to perform its final orbital insertion. A single uncrewed orbital test flight took place in November 1988. A second test flight was planned by 1993, but the program was canceled due to lack of funding and the dissolution of the Soviet Union in 1991. Two more orbiters were never completed, and the one that performed the uncrewed flight was destroyed in a hangar roof collapse in May 2002.