53 Pa. Stat. § 13405
In order that policemen, firemen and park guards of cities of the first class, who, after their appointment to such position, have entered the armed forces of the United States during the present hostilities shall not be put to a disadvantage because of such service after the effective date of this act; the rate of pay accorded to such policemen, firemen or park guards in cities of the first class shall be the same at the time of their honorable discharge from the armed services and their re-entry into the police, fire or park guard service as it would have been had such policemen, firemen or park guards in the cities of the first class been continuously employed as policemen, firemen or park guards for the days, months or years they served in the armed forces of the United States.
53 P.S. § 13405