Does his brigade commander have the authority to deploy additional forces to Afghanistan in support of OEF, as Lakin’s orders directly stated he was to do (starting by moving to the base from which he would be sent), without a valid order by the CIC?
The Brigade commander has the authority to issue orders necessary to have his instructions carried out, and to expect those orders to be obeyed. Lakin didn't and he's being court martialed for it. Obama's eligibility doesn't change that. Obama could be unmasked as a fraud and removed from office tomorrow, and Lakin would still be guilty of refusing to obey orders and with missing movement.