I was on the Safariland website & saw the corporate training group will have 2 armed intruder(school-campus) security training seminars.
One is in Lowell MA the other is in Jupiter Florida.
Check the Safariland website for prices, course details, ordering information, etc.
If you or someone you know has questions/concerns about school security & you work in a education field or school, you may want to look into it.
PS: before any net ninjas or gun shop rangers ask, Im not a employee, owner, supervisor or share-holder in Safariland/Armor Holdings Group.