I often dish out a lot of criticism towards he Department of Homeland Security. However, it is not without understanding the sheer vastness of what their work undertakes. I often peruse their site (and so should you) to gain insight into what they face. This site has always been a great information source and has been very responsive towards citizen queries. Though, I'm sure some would disagree. After you take a look, I highly recommend giving their site a look.
Department of Homeland Security Site:
http://www.dhs.gov