Evolving technologies are changing current bases and future plans
The U.S. military is rapidly working to make its bases all over the world more capable of defending against drone threats as several examples in recent years have demonstrated military installations are obvious targets with vulnerabilities.

TL;DR
- U.S. military bases worldwide are being equipped with enhanced drone defense systems.
- Recent incidents have shown military installations are vulnerable targets.
- The perception of military bases as sanctuaries is no longer valid, both domestically and internationally.