5 U.S. Code § 5377 - Pay authority for critical positions
(a)For the purpose of this section—
(1)the term “agency” has the meaning given it by section 5102; and
(2)the term “position” means—
(A)a position to which chapter 51 applies, including a position in the Senior Executive Service or the Federal Bureau of Investigation and Drug Enforcement Administration Senior Executive Service;
https://www.law.cornell.edu/uscode/text/5/5377