The B-52H BUFF [Big Ugly Fat Fellow] is the primary nuclear roled bomber in the USAF inventory. It provides the only Air Launch Cruise Missile carriage in the USAF. The B-52H also provides theater CINCs with a long range strike capability. The bomber is capable of flying at high subsonic speeds at altitudes up to 50,000 feet (15,000 meters). It can carry nuclear or conventional ordnance with worldwide precision navigation capability.
With a gross weight of 488 000 pounds, the B-52H is even today one of the heaviest offensive military aircraft operated by any nation in the world. Maximum speed of the B-52H is 639 miles per hour at 20,700 feet, or a Mach number of 0.91, and cruising speed is 525 miles per hour. Mission radius is 4,480 miles with a weapons load of 10,000 pounds. Many other combinations of payload and range are, of course, possible. Range is, of course, greatly increased by in-flight refueling.