谁能解释一下这句话的for的用法?theformerchiefscentistfortheUSgoverment'ssuperscrectspyorganization里面的for改用of行不行?

　　谁能解释一下这句话的for的用法?

　　theformerchiefscentistfortheUSgoverment'ssuperscrectspyorganization

　　里面的for改用of行不行?