Joint Terrorism Task Forces operate in 100 cities nationwide. They are based out of the 56 FBI Field Offices and 10 smaller offices around the country and include local and state law enforcement agencies. Full-time federal membership includes:

• FBI
• U.S. Marshals Service
• Bureau of Alcohol, Tobacco, and Firearms
• U.S. Secret Service
• U.S. State Department/Diplomatic Security Service
• Immigration and Customs Enforcement
• U.S. Border Patrol
• Postal Inspection Service
• Treasury Inspector General for Tax Administration
• Internal Revenue Service
• U.S. Park Police
• Federal Protective Service
• Department of Interior's Bureau of Land Management
• Defense Criminal Investigative Service
• Air Force Office of Special Investigations
• U.S. Army
• Naval Criminal Investigative Service
• Central Intelligence Agency
• State & Local Law Enforcement