I'd like to give the benefit of the doubt but if he landed at Travis thinking he was at Nut Tree probably time to try another hobby. They are 7 miles apart are separated by two cities, a freeway, and a 1500ft line of hills. Nut Tree has one 4700X75ft runway and Travis has two 11,000ft runways, miles and miles of concrete ramps and it's own zip code. With GPS and clear in a million weather..well you see where I'm going with this.
Same goes for a precautionary landing. There are 3 fields within 15 miles that are uncontrolled and easy to get in and out of. Unless I was on fire or gliding I think I'd pass on the hassle that would ensue after landing at a Military Installation without clearance or permission.
I'll keep my ears open to see what the deal was. It was pretty interesting seeing an RV sitting next to a C5. I've been trying to figure out a way for years to get my a pic of my plane sitting next to one.