The last B-52 was delivered October 1962. No joke.....
Some other tidbits;
A total of 744 B-52s were built with the last, a B-52H, delivered in October 1962. Only the H model is still in the Air Force inventory and all are assigned to Air Combat Command. The first of 102 B-52H's was delivered to Strategic Air Command in May 1961. The H model can carry up to 20 air launched cruise missiles. In addition, it can carry the conventional cruise missile which was launched from B-52G models during Desert Storm.
Barksdale AFB, LA and Minot AFB, ND serves as B-52 Main Operating Bases (MOB). Training missions are flown from both MOBs. Barksdale AFB and Minot AFB normally supports 57 and 36 aircraft respectively on-station.
The B-52H was designed for nuclear standoff, but it now has the conventional warfare mission role with the retirement of the B-52G’s. The B-52 can carry different kinds of external pylons under its wings.
The AGM-28 pylon can carry lighter weapons like the MK-82 and can carry 12 weapons on each pylon, for a total of 24 external weapons. With the carriage of 27 internal weapons, the total is 51.
Heavy Stores Adaptor Beam [HSAB] external pylon can carry heavier weapons rated up to 2000 lbs. However, each HSAB can carry only 9 weapons which decreases the total carry to 45 (18 external).
A third type pylon is used for carrying ALCMs/CALCMs/ACMs.
So the B-52 can carry a maximum of either 51 or 45 munitions, depending on which pylon is mounted under the wings. However, the AGM-28 pylon is no longer used, so the B-52 currently carries on HSABs, limiting the external load to 18 bombs, or a total of 45 bombs.
The use of aerial refueling gives the B-52 a range limited only by crew endurance. It has an unrefueled combat range in excess of 8,800 miles (14,080 kilometers).
Updated with modern technology, the B-52 will continue into the 21st century as an important element of US forces. There is a proposal under consideration to re-engine the remaining B-52H aircraft to extend the service life. B-52 re-engine plans, if implemented, call for the B-52 to be utilized through 2025. Current engineering analysis show the B-52's life span to extend beyond the year 2040. The limiting factor of the B-52’s service life is the economic limit of the aircraft's upper wing surface, calculated to be approximately 32,500 to 37,500 flight hours. Based on the projected economic service life and forecast mishap rates, the Air Force will be unable to maintain the requirement of 62 aircraft by 2044, after 84 years in service