(a) (1) (A) The employing agency shall deduct and withhold from the basic pay of an employee, Member, Congressional employee, law enforcement officer, firefighter, bankruptcy judge, judge of the United States Court of Appeals for the Armed Forces, United States magistrate,1 Court of Federal Claims judge, member of the Capitol Police, member of the Supreme Court Police, nuclear materials courier, or customs and border protection officer, as the case may be, the percentage of basic pay applicable under