Today the Shuttle is largely regarded as refurbishable, not reusable. Reusability was the goal, but the SRBs actually cost more to recover and refurbish than to just spin a new casing, and the orbiter was so thoroughly disassembled and inspected after each flight - including disassembling each SSME - that no definition of reusable for any other product would apply.

That said, it does seem that at least one of the X-37Bs actually is reusable, in the sense that that it seems to have no major disassembly occur between flights. But it is so closely guarded that we really have only hints, not facts.