text: _________________________________________________________________________________FM 2-22.3
  HUMINT collectors should also provide training in the area of tactical
  questioning to designated S2 personnel. The potential for abuse of the
  detainee is greatest at initial capture and tactical questioning phase. With
  the excitement and stress of the battlefield, unskilled personnel may exercise
  poor judgment or be careless and thus resort to illegal techniques to elicit
  critical information. Personnel who are not trained HUMINT collectors will
  not attempt to use approach techniques. Instructions must stress the
  importance of the proper treatment of detainees. Emphasize that in addition
  to legal requirements, the abuse of a detainee at the initial stage of contact
  often renders future interrogation futile. All treatment of detainees must be
  consistent with the Geneva Conventions. (See ST 2-91.6 for further
  information on tactical questioning.)
  5-80. Orders given to treat detainees in any way that violate the Law of War,
  including the Geneva Conventions, or that result in detainees being treated
  in any prohibited manner are unlawful. Every soldier must know how to
  respond to orders that he perceives to be unlawful. If a soldier receives an
  order that he knows to be unlawful, or that a person of ordinary sense and
  understanding would know to be unlawful, or if the order is not clear enough
  to determine if it is legal or not, he should follow the steps set out below
  (preferably in the order listed):
  • Ask for clarification.
  • State that the order is illegal if he knows that it is.
  • Use moral arguments against the order.
  • State the intent to report the act.
  • Ask the senior interrogator to stop the act.
  • Report the incident or order if the order is not withdrawn or the act in
  question is committed.
  • If there appears to be no other recourse, refuse to obey the unlawful
  order.
  NOTE: If the order is a lawful order, it should be obeyed. Failure to obey a
  lawful order is an offense under the UCMJ.
  5-81. None of the above actions should be taken in the presence of any
  detainee. Witnessing actions taken to determine the legality of an order may
  lead to increased resistance of the detainee and could lead to increased
  resistance throughout the detainee population if they believe they are being
  treated unlawfully.
  5-82. Illegal orders or incidents must be reported to the chain of command.
  However, if the chain of command itself is implicated, report the incident or
  order to the SJA, IG, chaplain, or provost marshal.