“How can you uphold your sworn oath to defend the Constitution and also serve in the Usurper’s army?”
Obama is anti-Constitutional, but is the Army at large? No. It operates on whole within the confines of the Constitution. So, no soldier must excuse himself from the military least be called a “usurper”. I wouldn’t label the entire military based on a label applied to the CIC.
All command authority is from the commander-in-chief.