He had the authority to order him to report to his office. He did not have LAWFUL authority to order him to get on a plane to any foreign country for combat operations without the approval of a CONSTITUTIONALLY-ACTING President. That was the condition that CONGRESS placed in the Authorization to Use Force, which was the lawful authorization for ANY COMBAT OPERATIONS.
“He had the authority to order him to report to his office.”
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And an order from a commanding officer with the authority to give it, which does not require the commission of a manifest crime, is by definition a lawful order. Lakin knowingly refused to obey a lawful order.
The court-martial existed for the sole purpose of determining whether Lakin had committed crimes, and it seems to me unquestionable that he did.