"I found a lot of stuff that's never been seen before. That was the goal: to not use cliché Cold War footage but give people a sense of the place and setting. It's a field you still need. At first it was a lot of fun, and then later it became a little bit intimidating. "Oh my God, I've got so much footage. Where am I going to put it? What am I going to do?" I ended up really only reviewing about 20 to 30 percent of what I had. So it was a task."