Parking right off of 31, either side. Walk down to...

Parking right off of 31, either side. Walk down to the guard station past the tracks a bit. Make sure you understand completely what they are telling you. I was told the wrong thing and went to the wrong building. For first timers the facilities can be a bit hard to navigate. In the day time I bet it's easier. Arrived at 0530 for 0800 appt and was given a door right away, even if it was the wrong one. Once corrected I was done by 0730. Friendly staff and nice place.