; or (B) purchase a Standard Terminal Automation Replacement System, or any equivalent system, and install and maintain such system using services directly from an original equipment manufacturer. (3) Requirements To help facilitate the integration of the equipment and technology described in paragraph (1), the Secretary— (A) shall establish minimum performance and technical standards that ensure the safe use of equipment and technology, including commercial radar displays capable of displaying primary and secondary radar targets, for use by controllers in contract towers to improve situational awareness; (B) shall identify approved vendors for such equipment and technology, to the maximum extent practicable; (C) shall establish, in consultation with contract tower operators, an appropriate training program to periodically train air traffic controllers employed by such operators to ensure proper and efficient integration and use of the situational awareness equipment and technology described in paragraph (1) into contract tower operations; (D) may add Standard Terminal Automation Replacement System equipment or any equivalent system to the minimum level of equipage necessary for Federal contract towers to perform the function of such towers, as applicable