SR-71 longest “TOP Secret” flight by Blackbird pilot

From “Smithsonian National Air and Space Museum”:

Museum Docent & SR-71 pilot Buz Carpenter describes his longest flight on a top secret reconnaissance mission.  Learn more about the Lockheed SR-71A Blackbird on display at the National Air and Space Museum’s Steven F. Udvar-Hazy Center in Chantilly, VA

Source: YouTube “Lockheed SR-71 Blackbird – Buz Carpenter’s Longest Flight”