He and his American hating agents have been replacing officers and purging the military for 6 years. He now probably has a military that would follow his orders no matter what they were. He has also been preparing for any sizable domestic uprising against his tyranny. The only thing that would stop him now would be millions of armed citizens overthrowing his government and he would call upon the military to try and put down the rebellion.
I just find it hard to believe that a U.S. Army ADA officer would not swallow hard before attacking an IDF aircraft. Likewise, a U.S. pilot ordered to do the same thing. Obama may be pushing military deference to civilian authority to the limit.