; and (5) enhance information-sharing, including the dissemination of homeland security information among such components and offices. (c) Composition and establishment of units (1) Composition IBET 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 personnel, 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 IBET units in regions in which such units can contribute to IBET missions, as appropriate. When establishing an IBET unit, the Secretary shall apply risk-based criteria that takes into consideration the following: (A) Whether the region in which the IBET unit would be established is significantly impacted by cross-border threats, including threats posed by transnational criminal organizations and terrorist groups. (B) The availability of Federal, State, local, Tribal, and foreign law enforcement resources to participate in the IBET unit. (C) Whether, in accordance with paragraph (3), other joint cross-border initiatives already take place within the region in which the IBET unit would be established. (3) Duplication of efforts In determining whether to establish a new IBET unit or to expand an existing IBET unit in a given region, the Secretary shall ensure that the IBET unit under consideration does not duplicate the efforts of other existing interagency task forces or centers within such region, including the Border Enforcement Security Task Force established under section 432. (d) Operation After determining the regions in which to establish IBET units under subsection (c)(2), the Secretary may— (1) direct the assignment of Federal personnel to such IBET units