program that issues a unique identifier, such as a known traveler number, that the TSA accepts as validating that the individual holding such identifier is a member of a known low-risk population. (c) Exemptions Nothing in this section shall affect— (1) the authority of the Administrator, under section 44927 of title 49, United States Code, to carry out expedited screening for members of the Armed Forces with disabilities or severe injuries or veterans with disabilities or severe injuries