Section 16
SEC. 16. The foregoing provisions of this Act shall not apply to firearms and ammunition therefor regularly and lawfully issued to officers, soldiers, sailors, or marines of the United States Army and Navy, the Constabulary, guards in the employ of the Bureau of Prisons, the police force of the city of Manila, provincial governors, provincial treasurers, and guards of provincial prisoners and jails, when such firearms are in possession of such officials and public servants for use in the performance of their official duties.