In 1964, a Boeing B-52H 61-023 bomber on loan from the Air Force back to Boeing for flight test encountered heavy sheer turbulence which broke the entire vertical assembly off of the aircraft in flight. This is the official US Air Force documentary film regarding the event.
Serial No. 61-023 is still in service and defends the United States. The plane is assigned to the 20th Aircraft Maintenance Unit where it is kept mission capable for the aircrews of the 20th Bomb Squadron.