16 Pa. Stat. § 5566
Vacancies occurring among the elective members of the board shall be filled by the organization which chose the members whose place it is desired to fill: Provided, however, That whenever it may appear that it is impossible to fill any vacancy in the board caused by the death or resignation of a member thereof because no organization survives to choose such members or no person survives who can qualify for such membership, vacancies so created and existing shall, upon notice from the secretary, be filled by the county organizations of the American Legion and the Veterans of Foreign Wars and the Italian American War Veterans of the United States, Incorporated. That is to say, the first vacancy so caused shall be filled by the county organization of the American Legion, and the second by the county organization of the Veterans of Foreign Wars, and the third by the Italian American War Veterans of the United States, Incorporated, and so on in rotation. If there is a loss of membership on the board or if an additional veterans' group seeks membership on the board, the General Assembly shall consider any veterans' group which applies in writing for membership. The General Assembly may admit a group to membership if all of the following apply:
16 P.S. § 5566