Else we're back to ergo propter hoc again. I don't know anyone who thinks there was a deep dark DOD conspiracy. But I certainly can believe in cover ups. The problem with a disease theory is that it's pretty hard to explain the exposure. The main reason no one, including me, believed there was such a thing as Gulf War Syndrome for so long was the development of cases in the US, and troops never exposed to any chemical agents.
Immunizations are a possible cause in that it reaches everyone who developed it.
The real question will be whether Garry's results can be duplicated. If the don't, that's the end of the theory. Like the Baltimore case, no one is going to settle this by arguing about it. There's certainly grounds for getting more data. If there's a long bureaucratic move to argue and not get more data, that says one thing.