A defense analyst works on issues related to the military, public safety, and security. You can find employment with the Department of Defense, the military, a private consulting firm, or another government agency. Your duties in this career can vary widely depending on where you work. In a Department of Defense job, your responsibilities often involve analyzing military operations or assessing threats. You can also study issues related to law enforcement or criminal justice, cybersecurity, or national security. While working for a government agency like the Transportation Security Administration (TSA), you would study operations and suggest operational improvements.