The SR-71 Blackbird
Here's a listing of some notable Blackbird missions. Some that changed history.
Also, at times various museum and other organizations hold special events to discuss and educate the public on the Blackbird program.
On 21 March 1968, USAF SR-71 #974 flew the First Operational sortie over Vietnam, piloted by Jerry O'Malley and RSO Ed Paine.