I think it's a very significant issue and I think it has a relatively simple solution, which is to reach out to veterans and simply ask them if they have had an anti-malarial drug in the past. Was it a weekly dosage one? That would tend to lean it towards having been mefloquine. Did they have any kind of significant reactions to that drug at the time?
From what I've heard, it's a fairly common reaction. I know the research is estimating that somewhere around 14% of people exposed to mefloquine may have that prodromal reaction.
It may very well be that a fair number of people have been missed. They may not be connecting something like an ongoing psychotic reaction, for example, to military service. It might be helpful for them to receive that information.