The Boone County Sheriff's Dept in Lebanon, Indiana (west of Indianapolis) hosts training classes each summer that are open to private citizens. Sheriff Ken Campbell is an adjunct instructor with Gunsite:
www.boonecountyindianasheriff.com -- click on the "training announcements" notice on the right toolbar.
(Col Jeff Cooper died in 2006)
Massad Ayoob used to run the Lethal Force Institute. He now calls his company the Massad Ayoob Group.
www.massadayoobgroup.com
Midwest Training Group in Illinois hosts several of his classes each year.