That’s the whole point: are the orders lawful or not?
The military has historically taken a very dim view of soldiers who question whether their orders are lawful. Officers who refused to go to Iraq, claiming the war was illegal, and specialists who refused to deploy to UN assignments, claiming that was illegal, have found themselves on the wrong end of a court martial verdict. Shall we champion their causes as well?
The military runs on discipline and discipline requires people to obey orders. If Lakin is convinced Obama is illegitimate and feels that he can't take orders from anyone in his chain-of-command because of it then he should have done the honorable thing and resigned 18 months ago when Obama was inaugurated. Or taken his stand then. Waiting 18 months until he's ordered overseas makes the timing of the whole matter look a tad suspicious.