There is nothing illegal about an order to deploy.
If the orders weren't issued under the proper authority there is.
You've sure got a lot of supposition and assumptions in your argument.
The prosecution doesn't need to prove anything. The orders are presumptively legal. Lakin can only plead guilty or not guilty. If he chooses to assert a defense that the orders were not lawful, then he must plead guilty as an affirmative defense. The burden of proof then falls to him, not the government. It's trial law 101.
"There you go presuming again. I did serve, in the Navy."
Then you must have missed your classes at OCS on the UCMJ. Just saying.
"You've sure got a lot of supposition and assumptions in your argument."
No sweetheart, I just have an iron-clad understanding of military law.