One thing that all these volunteers can do is to carry some sort of locator beacon or tracking beacon - so they could be found if there is an emergency. The single biggest thing that stops them from being rescued is that it is impossible to locate the kidnappers in a short period of time.
That sounds good in theory, but probably won't work so well in practice. These days the terrorist types aren't stupid, since so many of their buddies have been tracked by their cell phones and blown up. One would expect the first thing any terrorist with half a brain would do is thoroughly search hostages and get rid of any such devices.
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