The problem is that you don't understand the words politics and policy. You think politics is picture of unclad women with Congressmen on the front page of your supermarket tabloid. What politics is is the determination of the policies of the united states government. That is what Congress and senior administration officials and the very top military leaders do for a living.
The Congress believes that the decision about the propriety of LTC West's actions must begin with a debate about what are the policies of the U.S. government in this matter. An order is not an act of congress. It is a piece of paper signed by a general that supposedly implements the policies of the U.S. Government. That there is an order that says thus and such is only relevant if that order reflects the policies of the U.S. government. If it doesn't, then the order has no import. NONE. Duncan Hunter is engaging the debate on the policies of the U.S. Government. It is only if LTC West has undermined U.S. Policy that a judicial proceeding is in order. The JAG core cannot adjudicate that issue. That is a debated between Rumsfeld, the President and the Congress, and Duncan Hunter just said that he is not letting everyone off the hook by turning top level policy over to a bunch of JAG officers.