Each application filed with the Commission must be accompanied by letters or other forms of statement (in three copies) from six persons addressed to the Chairman, U.S. Parole Commission, attesting to the character and reputation of the applicant. The statement as to character shall indicate the length of time the writer has known applicant, and shall describe applicant's character traits as they relate to the position for which the exemption is sought and the duties and responsibilities thereof. The statement as to reputation shall attest to applicant's reputation in his community or in his circle of business or social acquaintances. Each letter or other form of statement shall indicate that it has been submitted in compliance with procedures under the respective Act and that applicant has informed the writer of the factual basis of his application. The persons submitting letters or other forms of statement shall not include relatives by blood or marriage, prospective employers, or persons serving in any official capacity with an employee benefit plan, labor organization, group or association of employers dealing with labor organizations or industrial labor relations group.