Why is there a random Customs and Immigration checkpoint here?

And why is California Highway Patrol on base?

Michael and I really went nuts trying to figure out what was going on, and oh the injustice of it all, and it looks like they are targeting the military, blah, blah, blah.

I even start texting and talking about it while at a 1st birthday party later that day.

The answer was solved Monday morning, when Michael checked his work e-mail that explained that it was a FILM CREW for a made-for-tv movie. I forgot that this base is a whore for filming location opportunities. Upon reflection, I did notice a camera and a boom, but I just dismissed that, because it didn't fit in with my scenario. Sheesh.