Travis is a major *strategic* AFB. It is the military version of LAX, and is critical to the entire Pacific region, as well as the Pacific fleet. As such it is a huge target.
Now, this being said, it is usually a *profoundly* bad idea to attack US airbases, because the US has been crystal clear that to us, this represents a huge escalation in a conflict.
For example: they attack our airbase with chemical weapons, we escalate to nuclear weapons. That serious.
Our airbases in conflict areas like Afghanistan and Iraq had at least 5 mile deep kill zones surrounding them.
Bottom line: if this twit is associated with any terrorist organization or country, they are quickly going to get seven bells kicked out of them.