participating in the Program. (g) Program review and report (1) Review The Comptroller General of the United States (in this subsection referred to as the Comptroller General ) shall conduct a comprehensive review of the Program, including the impact of the Program on the FAA’s aircraft certification processes and the presence of any conflicts of interest under the Program. (2) Report Not later than 3 years after the date of enactment of this section, the Comptroller General shall submit to the appropriate committees of Congress a report containing the results of the review conducted under paragraph (1), together with recommendations for such legislation and administrative action as the Comptroller General determines appropriate. (h) Sunset The Program shall terminate on the date that is 5 years after the date of enactment of this section. (i) Certified professional defined In this section, the term certification professional means an individual with expertise and background in a line or field that is concerned with, or likely to improve, the safety certification of aircraft and other airborne objects and systems, including the following: (1) Aerospace engineering. (2) Aerospace physiology. (3) Aeronautical engineering. (4) Airworthiness engineering. (5) Electrical engineering. (6) Human factors engineering. (7) Software engineering. (8) Systems engineering. 528. Contract Tower Program air traffic controller training programs Section 47124 of title 49, United States Code, is amended— (1) by redesignating subsection (e) as subsection (f)