With high-tech electronic equipment onboard, it gathered strategic reconnaissance information for the U.S. military for over 25 years. 
The SR-71 was developed by Lockheeds "Skunk Works" to replace the U-2 high altitude spyplane which had become vulnerable to interception by surface-to-air missiles. The SR-71 is very fast and with a top speed in excess of 2100mph it still holds many world speed records. In the early 90s the SR-71 fleet was mothballed but several aircraft have been reactivated by the continuing need for a manned reconnaissance capability.
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