Chris,
Thank you for your question. The Bureau of Diplomatic Security (DS) handles security and law enforcement for the Department of State. DS special agents are federal law enforcement officers who serve in the US and overseas. They investigate passport fraud and protect the Secretary of State and other dignitaries, and they advise ambassadors about security concerns, etc. The selection process for DS special agents is very competitive, but DS special agent is an excellent position. Let me know if you have any questions.