Moreover, just as armour or artillery may have trained and equipped for a very different kind of (force-on-force) war, it seems to me that the same has probably also been true (until recently) among MPs. Does anyone know how much evolution has taken place in doctrine and training in recent years?
Rex

From my perspective here I would say that active MP units have been among the most adaptative. That said, much of what you describe was already in their kit bag as relatively well practiced TTPs due to the Balkans. In the case of the AG MPs, that was a reserve unit. The real need has been all along not enough MP units to do MP tasks. And that has led to using a variety of units to perform MP tasks.

best

Tom