The TAC 30 Unit (SWAT) is a team that is trained in the use of special weapons, equipment and tactics necessary to contain, control and arrest suspects or individuals under circumstances that standard patrol deputies are ill-equipped to resolve without extreme personal hazards. 

The TAC 30 Unit may be called to the following situations:

• Counter-sniper activity
• To protect police officers, firefighters and the general public during unusually dangerous situations.
• Citizen and hostage rescue
• Provide security for diplomatic and government officials while visiting King County
• High risk or heightened security prisoner transports
• High risk search warrant and arrest warrant service
• Counter-terrorist operations
• Surveillance details
• Any situation by its apparent nature, which is life threatening and that would be beyond the scope of a normal police response or capability.
• Any response requiring specialized equipment
• Maritime security operations