Sounds like it is only an introduction interview. I had one with the Captain of Administrative Services. He gave me a packet to do the background, explained how to fill it out, had some basic conversations (not about anything related to the background) and he asked if I had any questions. It was nothing to get worried about.
But make sure you dress good. I wore a suit and tie, polished shoes, the whole deal. I looked like a hero. The positions I am going for has (6) people interviewing for it. (1) of the individuals showed up in his FEDEX uniform and another showed up in his workout clothes (sweatpants and a sweatshirt). So I looked like I was more serious about the job then those two.
Good Luck