Who gets to determine who an enemy of the Constitution is? Can you imagine each person deciding on their own who the enemy is? A legal conclusion to this has not been determined- until then, Obama is holding the office of President of the United States. He has not been legally determined to be ineligible. One can’t just go around taking actions based on an opinion, especially in the military. If that is your opinion, apply for conscious objector status the next time you are given an order by the CIC- don’t react with illegal behavior just because your opinion is the CIC isn’t eligible.
That determination is made by the consent of the governed and is not determined by the government in any of its branches.