Any person subject to this code who, while in the hands of the enemy in time of war:

1. (1) For the purpose of securing favorable treatment by that person's captors acts without proper authority in a manner contrary to law, custom, or rule, to the detriment of others of whatever nationality held by the enemy as civilian or military prisoners; or

2. (2) While in a position of authority over such persons maltreats them without justifiable cause;

   shall be punished as a court-martial may direct.