Charges and specifications shall be signed by a person subject to this title under oath before a commissioned officer authorized by § 13A–1102 of this title to administer oaths and shall state: that the signer has personal knowledge of, or has investigated, the matters set forth therein; and that they are true in fact to the best of the signer’s knowledge and belief. On the preferring of charges, the proper authority shall take immediate steps to determine what disposition should be made thereof in the interest of justice and discipline, and the person accused shall be informed of the charges as soon as practicable.