; and (2) enhancing information-sharing, including the dissemination of homeland security information, among such agencies. (c) Composition and establishment of border tunnel task force units (1) Composition BTTF units may be comprised of personnel from the following: (A) U.S. Customs and Border Protection, led by the U.S. Border Patrol. (B) U.S. Immigration and Customs Enforcement, led by Homeland Security Investigations. (C) Other Department components and offices, as appropriate. (D) Other Federal, State, local, Tribal, and foreign law enforcement agencies, as appropriate. (E) Other appropriate personnel at the discretion of the Secretary. (2) Establishment of units The Secretary is authorized to establish BTTF units in regions in which the Secretary determines such units can contribute to the Department’s border security efforts to identify, reduce, and remediate cross-border tunnel threats. When establishing a BTTF unit, the Secretary shall apply risk-based criteria that takes into consideration the following: (A) Whether the areas in which such BTTF units would be established are significantly impacted by cross-border tunnel threats. (B) The availability of Federal, State, local, and Tribal law enforcement resources to participate in such BTTF units. (C) Whether other similar joint cross-border tunnel detection initiatives already take place within the region in which the BTTF unit would be established. (d) Duplication of efforts In determining whether to establish a new BTTF unit or to expand an existing BTTF unit in a given region, the Secretary shall ensure that the BTTF unit under consideration does not unnecessarily duplicate the efforts of other existing interagency task forces or centers within such jurisdiction. (e) Operation After determining the regions in which to establish BTTF units under subsection (c)(2), the Secretary may— (1) direct the assignment of Federal personnel to such BTTF units