What finial or ornament should go on top of a flagpole?

Good question. The answer has several components. First, the US flag code is silent on this issue. It says nothing about only the US flag being able to take the eagle. So there is no help from that source. Second, in my experience, most civilian users do use eagles on both. Third, however, there is a tradition, which I personally adhere to, for using the eagle only on the US flag and some other ornament on the other flags. I just feel it reserves a special distinction for the US flag. Many people do follow this method. I suggest a round spear. Fourth, it is possible that your state has enacted some type of law in this regard. Individual states do have various rules about flag usage and I do not know yours. Maybe ask your Attorney General's office. Fifth, the military quite certainly has rules of flag protocol that apply to this and other issues. Click on the link above to West Point Protocol Office. I have seen this question addressed in those army regulations. Military regulations are not binding on civilian situations. As well, the various military branches can have rules that disagree with each other. To sum up, absent any local or state ordinance, in my opinion, it is proper for you as a civilian to use eagles on both flags OR to reserve the distinction of the eagle for the US flag. Either way is proper. I feel the eagle, our national bird, is best reserved for Old Glory. Does this help?