Quote Originally Posted by Gnoman View Post
Even assuming that you could learn "exactly what wizards could do," it wouldn't be just a matter of "cleaning house." Wizards have the power to become completely invisible, look like anyone, control anyone (muggles would be more vulnerable to the Imperius curse than wizards, as very few of them have any training in defending against magical mental attacks), and heal from the most severe wounds in minutes. More likely, if a modern military was able to learn all that, they'd become extra cautious and paranoid.
You're not even dealing with the central issue here, which is that once muggle governments know they're dealing with Magic, they can employ mudbloods and other pro-muggle wizards to root out Voldemort infiltrators, or even come up with screening processes to weed out people under mind control (I doubt they'd hold up to polygraph testing and profiling).

From their, it's a matter of using their superior numbers, organization and combat experience to eradicate Voldemort's inner-circle from the top down.