Protection performing activities that are critical to border security or customs enforcement, as determined by the Commissioner. (3) Rate of basic pay The term rate of basic pay — (A) means the rate of pay fixed by law or administrative action for the position to which an employee is appointed before deductions and including any special rate under subpart C of part 530 of title 5, Code of Federal Regulations, or similar payment under other legal authority, and any locality-based comparability payment under subpart F of part 531 of title 5, Code of Federal Regulations, or similar payment under other legal authority, but excluding additional pay of any other kind