; (C) in paragraph (2)— (i) by striking Attorney General and inserting Secretary of Homeland Security ; and (ii) by striking construction of fences and inserting the construction of physical barriers ; and (D) by amending paragraph (3) to read as follows: (3) Agent safety In carrying out this section, the Secretary of Homeland Security may not construct reinforced fencing or tactical infrastructure, as the case may be, that would, in any manner, impede or negatively affect the safety of any officer or agent of the Department of Homeland Security or of any other Federal agency. ; (3) in subsection (c), by amending paragraph (1) to read as follows: (1) In general Notwithstanding any other provision of law, the Secretary of Homeland Security is authorized to waive all legal requirements the Secretary, in the Secretary’s sole discretion, determines necessary to ensure the expeditious construction, installation, operation, and maintenance of the tactical infrastructure and technology under this section. Any such decision by the Secretary shall be effective upon publication in the Federal Register. ; and (4) by adding after subsection (c) the following new subsections: (d) Construction, installation, and maintenance of technology (1) In general Not later than January 20, 2021, the Secretary of Homeland Security, in carrying out subsection (a), shall deploy the most practical and effective technology available along the United States border for achieving situational awareness and operational control of the border. (2) Technology defined In this subsection, the term technology includes border surveillance and detection technology, including— (A) radar surveillance systems; (B) Vehicle and Dismount Exploitation Radars (VADER); (C) 3-dimensional, seismic acoustic detection and ranging border tunneling detection technology; (D) sensors; (E) unmanned cameras