Section 2
SEC. 2. Section four of Commonwealth Act Numbered One hundred and eighty-six is hereby amended to read as follows: "SEC. 4. Scope of application of System.- (a) Membership in the System shall be compulsory upon all regularly and permanently appointed employees, including those whose tenure of office is fixed or limited by law; upon all teachers except only those who are substitutes; and upon all regular officers and enlisted men of the Armed Forces of the Philippines: Provided, That it shall be compulsory upon regularly and permanently appointed employees of a municipal government below first class only if and when said government has joined the System under such terms and conditions as the latter may prescribe. "(b) Membership in the System shall be optional with an elective official of the National Government or of a local government that is a member of the System: Provided, That if he desires to come within the purview of this Act, he must notify the System in writing to that effect: Provided, further, That he complies with the requirements of the System and that he is in the Government service when his insurance takes effect: And provided, finally, That after his admission into the System he shall be entitled to life insurance benefit for which he shall pay either one per centum or three per centum of his monthly salary, depending on the kind of insurance selected by him, and his employer shall likewise pay for him the same amount."