One additional new development is the use of combat stress
inoculation through force-on-force paint bullet training, which has been
addressed previously. There is tentative evidence that would lead us to
believe that this has reduced the fear-induced spray-and-pray response and
increased law enforcement hit rates (as opposed to firing rates) from around
20 percent to approximately 90 percent. Lt. Col. Dave Grossman, On Combat

Sheepdog Tip of the Day, Before Combat tip 64

I feel FOF is one training you can never get enough of, as each time is different.