; (3) address ways to support joint training for IBET stakeholder agencies and radio interoperability to allow for secure cross-border radio communications; and (4) assess how IBETs, 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 adding after the item relating to section 434, as added by section 1117(b), the following: Sec. 435. Integrated Border Enforcement Teams. . 1131. Tunnel Task Forces The Secretary is authorized to establish Tunnel Task Forces for the purposes of detecting and remediating tunnels that breach the international borders of the United States. 2 Personnel 1141. Additional U.S. Customs and Border Protection agents and officers (a) Border patrol agents Not later than September 30, 2021, the Commissioner of U.S. Customs and Border Protection shall hire, train, and assign sufficient agents to maintain an active duty presence of not fewer than 26,370 full-time equivalent agents. (b) CBP officers In addition to positions authorized before the date of the enactment of this Act and any existing officer vacancies within U.S. Customs and Border Protection as of such date, the Commissioner shall hire, train, and assign to duty, not later than September 30, 2021— (1) sufficient U.S. Customs and Border Protection officers to maintain an active duty presence of not fewer than 27,725 full-time equivalent officers