When any officer or enlisted man becomes permanently disabled or is physically disqualified for the performance of military duty by reason of wounds, injuries or illness, he may, upon his own application or in the discretion of the commander in chief, be ordered before a retiring board for examination as to his physical fitness for military service and, upon the recommendation of such board, may be placed upon the retired list. However, no officer or enlisted man shall be so placed upon the retired list because of physical disabilities which are the result of intemperance or improper habits or conduct upon his part. For the purposes indicated under the preceding paragraph of this section, the Commander in Chief may appoint retiring boards, which shall be constituted and have cognizance of the same subjects and possess like powers as similar boards organized under the laws of the Armed Forces of the United States. The proceedings of retiring boards shall be assimilated to the forms and mode of procedure prescribed for like boards under the regulations for the Armed Forces of the United States.