Many homeland security jobs are with State, Federal or local governments. Since 2001, the U.S. Department of Homeland Security (DHS) has promoted homeland security and coordinates homeland security efforts among other government agencies and private industry.
The Department of Homeland Security is a federal agency, with its website at dhs,gov. This has been an expanding field, with many jobs created. The website has information about how to apply, and interview tips. There are also tips for veterans.
The Bureau of Labor Statistics published a detailed guide to Careers in Homeland Security available free online by clicking on the preceding link.