ASF, as the name suggests, is only for the Security of Airports. I will not delve into the details of organizational structure and other aspects here rather advise joining if you have no other job at the moment. If you are employed in the same grade or above in another organization then I would say to pursue other better options. Your Educational Background is another aspect to consider here. Don't fall for authority shenanigans, remember one thing there's no utopia, unfortunately in Pakistan people are more driven to this notion of authority than professionalism that is exactly what's wrong with almost every organization here.

P.S I work at the Airport.