There is hereby created in each borough, incorporated town and township of the first class where a police force of not less than three members is being maintained a civil service commission, hereinafter referred to as the commission. Each commission shall consist of three commissioners who shall be qualified electors of the political subdivision for which appointed and shall be appointed initially to serve for the terms of two, four and six years, and, as terms thereafter expire, shall be appointed for terms of six years as follows:

In the case of a borough the appointments shall be made by the borough council; in the case of an incorporated town appointments shall be made by the town council, and in the case of the townships of the first class the appointments shall be made by the township commissioners.

The members of each commission first appointed under the provisions of this act shall be so appointed within thirty days after effective date of this act.

Any vacancy occurring in any commission for any reason whatsoever shall be filled for the unexpired term within the period of thirty days after such vacancy occurs. Such vacancies shall be filled by the appointing power which made the original appointment.

Each member of the commission created by this act before entering upon the discharge of the duties of his office shall take an oath or affirmation to support the Constitution of the United States and of the Commonwealth of Pennsylvania and to perform his official duties with fidelity.