(1) Any person subject to this Act who disobeys in such manner as to show a wilful defiance of authority any lawful command given personally by his superior officer in the execution of his office whether the same is given orally, or in writing or by signal or otherwise, shall, on conviction by a Coast Guard Court, be liable to suffer imprisonment for a term which may extend to fourteen years or such less punishment as is in this Act mentioned.
     (2) Any person subject to this Act who disobeys any lawful command given by his superior officer, shall, on conviction by a Coast Guard Court, be liable to suffer imprisonment for a term which may extend to seven years or such less punishment as is in this Act mentioned.