Section 3
SEC. 3. Judicial and administrative officers of the Insular Government and of the different provinces of the Philippine Islands, including the Department of Mindanao and Sulu; persons in the military or naval service of the United States and of the Philippine Islands; clerks of the Bureau of Customs, letter carriers, artificers and workmen employed in the armories, arsenals and dockyards of the United States and of the Philippine Islands, and harbor pilots, shall be exempt from duty in the militia, regardless of their age.