U.S. Customs and Border Protection
- Includes the former Border Patrol and Customs Service. Missions include detecting and preventing the illegal entry of persons and goods into the country.
- http://www.cbp.gov/

Animal and Plant Health Inspection Service (APHIS)
- Information on animal and plant health/disease topics, USDA regulations, control of invasive species, agricultural chemicals, and related public health issues.
- http://www.aphis.usda.gov/

Federal Law Enforcement Training Center (FLETC)
- Network of federally operated training centers for law enforcement personnel. Course catalog and program descriptions, news and event information, and background information provided.
- http://www.fletc.gov/

Transportation Security Administration
- Charged with providing effective and efficient security for passenger and freight transportation in the United States. Mission, press releases, employment, milestones and contact information.
- http://www.tsa.gov/