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Not sure, but SpaceX has performed plenty of them.

Not so much over the US, though.

I would beg to differ. SpaceX certainly flown unmanned, rocket powered test flights both from McGregor[1], and Cape Canaveral[2]. Those were in the US last time I checked.

1:http://en.wikipedia.org/wiki/Grasshopper_(rocket)#Flight_tes... 2: http://en.wikipedia.org/wiki/Falcon_9#Launch_history

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