Kafka!? Who was he? I fly airplanes for a living. If you don't keep it simple I won't understand.

First off, the Lance Corporal has to know the language or he can't ask him anything. And he should know something about the area and the people who live in it or he won't know what to ask him even if he could. You know, all that COIN stuff.

If he can't ask effective questions he should send the guy back to somebody who can. The system outlined in "Suggestions for Japanese Interpreters Based on Work in the Field" would seem to be a good one.

You imply that it is is necessary for the Lance Corporal to go beyond asking the guy things. Why?

If you want definition of what is permitted or not permitted, how about this. Whatever physical action would get a patrol officer in trouble in the US isn't permitted.