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The SR-71 was a real jet that took off with a pilot at the controls and cruised for thousands of miles, then landed. This thing was air launched on a large rocket, and once it hit Mach 5+ its engine kicked in for 10 seconds, burning 2 lbs of fuel. The craft's engine did not accelerate the craft up to that speed, the rocket did. If you going to compare an unpiloted drone to the SR-71, then you'd have to say that the SR-71's record fell in the 1960's, when the ramjet powered D-21 drones were tested. 
They were launched from modified SR-71's, called M-21's. 
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