Every person subject to naval law, who,--
         (a) traitorously holds correspondence with the enemy or gives intelligence to the enemy; or
         (b) fails to make known to the proper authorities any information he may have received from the enemy; or
         (c) assists the enemy with any supplies; or
         (d) having been made a prisoner of war, voluntarily serves with or aids the enemy;
shall be punished with death or such other punishment as is hereinafter mentioned.