As you can see, GA’s and Supreme’s cannot override the Presidents orders, (to the military because he has control over the military), and the President and Marshall are both above COO in military rank. COO therefore resides right below the Marshall in military rank. Also since FG members are not part of the military, the President cannot order FG members either, including the COO.
This doesn’t mean that Supremes and GA’s can’t make laws to block the president from doing a specific order to the military, and this doesn’t mean that the President can order the military to do something that violates the law. Its all part of checks and balances.
This also means that if you are a Supreme, you might consider running for president. Haha
P.S.: A lot of people believe that the Presidency is obsolete, but in reality the Presidency has incredible power, but not many have really tapped into that power or understood it. I fully tapped into that power and widened the power back in 2012-2013 in which I became president multiple times and reformed the entire GSA.