If there was no reasonable alternative to mefloquine, then I would say that it would have to be given under careful supervision. However, because there are at least two drugs—I'm talking about doxycycline and atovaquone-proguanil—that are as effective at preventing malaria but that have a much better side effects profile, then, really, it makes no sense to give mefloquine at all, under any circumstances, to the troops. They're a vulnerable population and we need to protect them.
On May 15th, 2019. See this statement in context.