To those that wanted me to expound a little on the use that AFOSI put their M36s to, here is a little more info.
All AFOSI Agents were, at the time I was in the organization, required to qualify twice a year. The qualifying was virtually an all day affair. I don't remember exactly how many rounds we put through them each time, but it was a considerable number.
If you were on one of the specialty teams, or some other type of special ops, you were required to qualify four times a year. Same courses of fire, plus additional. We fired both double and single action courses. I was a four timer.
Now, these guns should have held up with no problem. S&W guaranteed them to do so when the Air Force bought them. They were bought to replace the M15 to enable AFOSI Agents to have a more concealable weapon under our suit and sports coats. The ammo that was used exclusively was the military .38spl hard ball. I don't know from whom this ammo was purchased. I do remember, however, that the quality control surrounding its manufacture didn't seem to be the best. Most of the rounds felt like maximum .38spl loadings without being +P, a loading which we didn't really have back then. Some felt like a .22lr and if we couldn't positively determine that we had hit the target, we would check the barrel to ensure that the bullet had exited. And sometimes, it felt like a damn fullhouse .357.
The final result was that a number of these revolvers experienced problem such as, bulged cylinders, cracked forcing cones, extremely excessive end shake, and binding when trying to fire them. It got so bad that AFOSI started to look for a new gun, just 3 to 4 years after the M36s had been put into service.
It might have been the ammo? It might have been a number of guns in which the steel just had been made correctly? It might have been a number of things. Of course, not all of the guns purchased experienced these problems. But enough of them did that it caused a logistic problem keeping serviceable guns in the field. Periodically, all of the guns had to be cycled through the Air Force Armory at Lackland AFB for complete checkouts and necessary repairs.
That's about all I can tell you as I was not personally involved with the decisions surrounding the gun.