These "Application Support Centers" are manned by contractors, I believe. The people in the ASC I went to didn't even bother to look sharp, they dressed rather casually. At my ASC they gave me a hard time for showing up early, but I just told them that I couldn't make it for the scheduled date. They pointed out that I should have rescheduled the appointment following the instruction on the letter, but I just stood there and see if they were going to turn me away, considering the place was literally empty except for the two employees and a couple of other applicants. The place had enough seating for 40-50 people. I ended up doing it that day.