http://www.tridentconcepts.com/index.asp?page=apply

"IMPORTANT NOTE:
Due to recent events, we will be requiring more stringent student credentials to participate in any Trident Concepts training courses. Failure to complete the application will result in non-enrollment. It is the responsibility of the enrollee to ensure we have all the appropriate material to verify the credentials. Failure to do so could result in denied enrollment or delayed enrollment. Please review the student credentials below and choose the appropriate selection(s). "

"Section Two: Student Credentials
Valid State Concealed Weapon Permit
Active Duty Military/Reserves
Active Law Enforcement Officer
Character reference"

"Character reference

Provide two letters of "character" from prominent figures of your community who have know you personally for a minimum of two years. Mail both copies together along with your course date and contact information to the address listed above."

Looks to me like all of the classes are geared to prevent civilians from participating