They had two days to report to the horse track. He was in line on the first day with his mother when he dropped out. The FBI came for him because it looked like he was hiding from authorities to defy the order to report. Which he was.
The camp they are using is made up for the show. The closest real one was at Tule Lake, CA near the Oregon border. There were no camps actually in Oregon. All the camps that I've seen are in dry, low vegetation areas, not nice thick pine forest.
I'm having trouble telling people apart, but I had the same problem with the sailors.
Loved the 3 guys handling the spy by leaving him stranded on the ice.