; (3) identifies and assesses the impact of certain challenges on the sustainment of cross-border IBET operations, including challenges faced by international partners, and planned corrective actions; (4) identifies and assesses costs associated with IBET units broken down by relevant categories designated at the Secretary’s discretion; (5) identifies ways to support joint training for IBET stakeholder agencies and radio interoperability to allow for secure cross-border radio communications; and (6) identifies and assesses ways IBET, Border Tunnel Task Forces, Border Enforcement Security Task Forces, and the Integrated Cross-Border Maritime Law Enforcement Operation Program can better align operations, including interdiction and investigation activities. . (b) Clerical amendment The table of contents in section 1(b) of the Homeland Security Act of 2002 is amended by striking the items relating to sections 435 and 436 and inserting the following new items: Sec. 435. Maritime operations coordination plan. Sec. 436. Maritime security capabilities assessments. Sec. 437. Integrated Border Enforcement Teams. . 3. Border tunnel detection (a) In general Subtitle B of title IV of the Homeland Security Act of 2002 ( 6 U.S.C. 211 et seq.) is amended by adding at the end the following new section: 420. Border Tunnel Task Forces (a) Establishment There is established within the Department a program to be known as the Border Tunnel Task Force program (referred to in this section as BTTF ). (b) Purpose The purpose of BTTF established pursuant to subsection (a) is to enhance and integrate border security efforts by identifying, reducing, and remediating cross-border tunnel related threats by— (1) facilitating collaboration among Federal, State, local, and Tribal law enforcement agencies to execute coordinated activities