Any person subject to this code shall be punished as a court-martial may direct if the person, while in the hands of the enemy in time of war, does any of the following:
1. For the purpose of securing favorable treatment by the captors acts without proper authority in a manner contrary to law, custom, or regulation, to the detriment of others of whatever nationality held by the enemy as civilian or military prisoners.
2. While in a position of authority over such persons maltreats them without justifiable cause.