.
9-10 are generally considered war crimes, but there is some ambiguity. For example soldiers away from home get antsy without female companionship. If a commander does not allow his troops to rape the locals, they may be resentful or even rebellious and this could jeopardize the discipline he is able to maintain. Does this count as personal pleasure or logistical efficiency?
Quite simply, let the troops have a dirty magazine and a little free time to themselves. Raping the locals is always unacceptable (and making use of local prostitiutes highly questionable), and any soldier engaging in such crimes should be subject to immediate court martial.
We have an army of professionals, not a bunch of undisiplined thugs. Raping locals would be discracing the uniform they wear, and they should be handled accordingly for having besmirched our good name with thier criminal behavior.
2-4 btw, minimizing 4 if possible.