Our church runs around 400 Sunday morning, and we have about 40 guys total on rotating teams so we are on security every other week. About 30 of us on the teams have our carry permits. Our church has Brotherhood Mutual Insurance, which fully insures security team members for liability, medical, legal, etc with a $1 million cap (if my memory serves me right). It is very good coverage. The insurance requires permits for anyone carrying on security for them to be covered. We had a rep from the insurance come out about 10 months ago and fill us in on all that the insurance covers and it is outstanding.
Our church has had cameras installed that cover every entrance/exit and most of our campus. We usually have one team person doing nothing but watching cameras, one on each main entrance, one roving the parking lot via golf cart, and one in the auditorium all with radios. We also have a designated rapid response team. In case of medical emergency, we are blessed to have a number of nurses/medical people that attend our church. We also make sure to lock our main entrance doors usually about 5 mins after our services start and just let people in who are running late.
The guy who is leading our security team is really working to increasingly get us better organized. I think he's doing a great job so far. He shoots monthly with a few others in a local amateur competitive event. Another guy in our church has made available a range he has on his property for anyone on the team that wants to go through a basic modified FBI qualification course just to evaluate ourselves. He's working on trying to get us more organized training, but there isn't much available in our area. We have a quarterly meeting to discuss any security issues.
I am glad that our guys seem to all take security seriously, and our church is appreciative of it. Of course we have people with all different levels of firearm proficiency. I am retired Army so firearm handling, shooting, and safety are pretty second nature for me.
Its neat to hear what other churches are doing.