Force on Force using simunitions changes the hole game on building clearing. You are much more aware of what you are doing when you may get shot.
We have several law enforcement agencys qualify at our range. The last time our Conservation Agents trained/qualified they had Smurf Blue Glock training pistols that shot an 8mm paint ball. They must have gotten them when they got the new Gen 4 Glocks. We have a Shoot House, and they were practicing in it.