I am on our church security team there are 15 of us total and 3 on at any given time and when not on duty I set in the back and watch for anything going on. We had a training session not long ago and part of it was with a computer program that had different scenarios and we used sirt guns.
I am on a security team at my church, between both services we have about 400 people that attend. We have 3 people on the team that covers a kids area and one at each of two entrances. I also carry a sig 365