The 61-023 B-52H Stratofortress depicted here was flying at 14,300 feet and about 345 knots, when it encountered severe clear air cross-turbulence (a Colorado mountain gust of about 100 mph) and lost the vertical stabilizer.  The crew managed to fly it to a safe landing in Arkansas.
United States Air Force
1964-01-10
United States Air Force, Directorate of Aerospace Safety, Norton AFB