Anti-Terrorism Battalion (ATBN) was a specialized-infantry battalion in the United States Marine Corps. It was deactivated as of 2007. Its reserve unit has not be disbanded & currently the unit falls under the 4th Marine Division as part of the Marine Forces Reserve. This unique unit possessed organic capabilities such as intelligence and counter-intelligence cells, combat engineers, enhanced nuclear, biological and chemical teams, and riflemen trained in advanced urban warfare. Note: ATBN is not to be confused with FAST Marines.