(ANGOLA) - Retired United States Air Force Colonel Richard Graham is scheduled to speak next Tuesday night at Trine University's Fabiani Theatre starting at 7:00pm. His visit is being sponsored by the Wade Department of Mechanical and Aerospace Engineering in the Allen School of Engineering and Technology. Colonel Graham retired in 1989. He has flown more than 750 hours in the world's fastest and highest flying aircraft, the Lockheed SR-71 Blackbird which is able to fly at nearly 2,200 miles an hour. The Air Force used the aircraft from 1966 to 1998. Everyone is invited to attend his presentation.