I can see the Texas state flag beside me, and the brownish building behind me.
I noticed the uniform on the person to the left and double-checked that it could be United States Air Force (USAF). I went to university in San Antonio so I knew there were multiple bases in the state. Now, you could have been at random tourist site but I saw the fan on the pole and thought--that's weird, maybe it's a parade ground or a viewing spot for a parade ground?
I did some image searches for the various AF bases. The building in the background is one of several of that design at Lackland Air Force Base. They comprise the Basic Military Training (BMT) portion of the base.
For instance, if you scroll down on this 331st squadron's webpage, you'll see a picture of the building.