I looked into this a little because I was curious. I guess the ostensible "national security" rationale (which clearly is not the only reason!) for this is that turbines severely degrade the utility of radar surveillance along the coastlines. This is particularly relevant for low-altitude incursions and drones. Now, other large governments (UK) have resolved this in several ways, including the deployment of additiona…
I feel like the defense against drones is denser, sharper turbines.
The Brit’s have the right approach, just put radar on them so now you can see past them.