Exactly.
Of course, what one has to bear in mind is that if you're a soldier, you don't go to your sergeant major and say you're feeling a bit anxious or a bit depressed or you're having nightmares. You would be told to just carry on with it.
You wouldn't associate it with the medication you're taking, so you'd just carry on taking it. All the evidence is that if you carry on taking mefloquine, the adverse effects become more intense and the risk is that they become prolonged and perhaps permanent, as has happened in some cases.
Those types of risks don't apply to tourists and general travellers, who usually take it for only a couple of weeks. Here, we're talking about soldiers who may have to take this drug for typically six months, and in my view, that represents an unacceptable risk.