Yes he did. After they REFUSED to allow him to use his actual defense.
Which was what? Obama was illegitimate? He may well be, but the officers whose orders Lakin refused to obey were legitimate and the orders were legal. That is what Lakin was charged with and that's what he admitted he was guilty of. He thought that he could make it all about Obama. But because of the way he chose to pursue that goal, he gave the Army the opportunity to charge him with crimes that had nothing to do with Obama and everything to do with good order and discipline. So Lakin's mistakes started long before he dreamed up his defense.