Yep, background info is starting to come through.
If you are asking about the USMC Mountain Warfare Center, that is several states away in California. IF the 'main compound' is what you are asking about, it is the main building and administration area of the National Park/Forest/Wilderness that stretches out from Garen and Bekka's back door, where Doug works. It has been mentioned earlier in part two and part oneGetting involved. So is this center the one that Garen's crew were watching?