I know there is a mention of paramilitary training being illegal in CRS. As far as teaching "military training.." I don't know if it is listed in CFR. That is a VERY grey area that is controlled by DDTC and ITAR issues (if working with foreigners), none of which give slaps on the wrist. Most instructors will NOT teach "military technology" ie room entry, team tactics, breaching to civilians for this reason. If you do see someone teaching this stuff, they usually don't know what they are doing, hence the great amount youtube videos of idiots doing this stuff and almost killing themselves....if only darwin would step in at those moments.