The light spot above the word WHY is the station.
In this picture you can see the square layout of the station about 100 yards north of the town Why, AZ and 10 miles south of Ajo, AZ. I guess they didn’t want to have a sign on the outside of the fence, “WHY BORDER PATROL STATION” and every time a border patrol person is ask what station they work out the answer would be, “Why.”