; and (2) not less frequently than every 3 years, update such training materials. . (d) Independence Section 220541 of title 36, United States Code, as amended by subsection (c), is further amended by adding at the end the following: (f) Independence (1) Prohibition A former employee or board member of the corporation or a national governing body shall not work or volunteer at the Center during the 2-year period beginning on the date on which the former employee or board member ceases employment with the corporation or national governing body. (2) Conflicts of interest An executive or counsel for the Center shall be considered to have an inappropriate conflict of interest if the executive or counsel also represents the corporation or a national governing body. (3) Investigations (A) In general The corporation and the national governing bodies shall not interfere in, or attempt to influence the outcome of, an investigation. (B) Report In the case of an attempt to interfere in, or influence the outcome of, an investigation, not later than 72 hours after such attempt, the Center shall submit to the Committee on Commerce, Science, and Transportation of the Senate and the Committee on Energy and Commerce of the House of Representatives a report describing the attempt. . (e) Funding Section 220541 of title 36, United States Code, as amended by subsections (c) and (d), is further amended by adding at the end the following: (g) Funding (1) Mandatory payments (A) Fiscal year 2019 Not later than 30 days after the date of the enactment of this subsection, the corporation shall make a mandatory payment of $20,000,000 to the Center for operating costs of the Center for fiscal year 2019. (B) Subsequent fiscal years Beginning on January 1, 2020, the corporation shall make a mandatory payment of $20,000,000 to the Center on January 1 each year for operating costs of the Center. (2) Funds from national governing bodies The corporation may use funds received from one or more national governing bodies to make a mandatory payment