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Department of Homeland Security (DHS):
The Department of Homeland
Security has a vital mission: to secure the nation from the many
threats we face. This requires the dedication of more than 240,000
employees in jobs that range from aviation and border security to
emergency response, from cybersecurity analyst to chemical facility
Homeland Security is a very large "parent" agency that houses many other prominent agencies, such as FEMA, the Coast Guard, and the Secret Service.