Section 1. Hereafter it shall be unlawful for any person or association or persons not in the service of the Armed Forces of the Philippines of the Philippine Constabulary to use, or confer upon himself or another who is not in the service of the said Armed Forces or Constabulary, any military or naval grade or title which is, or may hereafter be, prescribed by laws and regulations for the use of the Armed Forces or Constabulary: Provided, That the foregoing shall not be construed as prohibiting the use of such military or naval grades or title by personnel or persons now authorized by law and by the following persons:
All veterans of any war when recognized by the Philippine or United States Government and only for the ranks for which they are recognized;
Commissioned officers and personnel, retired or in active duty, of the Bureau of Coast and Geodetic Survey, of the quarantine service, and of the customs service;
Commissioned and enlisted reservists including recognized guerrilla officers on inactive status when using their authorized grades for a purely military purposes;
Trainees in the Armed Forces while undergoing any period of trainee instruction pursuant to law.