qualified trade-of-time arrangement
(2) In this subsection— (A) the term “firefighter” means an employee— (i) the work schedule of whom includes 24-hour duty shifts; and (ii) who— (I) is a firefighter, as defined in section 8331(21) or 8401(14); (II) in the case of an employee who holds a supervisory or administrative position and is subject to subchapter III of chapter 83, but who does not qualify to be considered a firefighter within the meaning of section 8331(21), would so qualify if such employee had transferred directly to such position after serving as a firefighter within the meaning of such section; (III) in the case of an employee who holds a supervisory or administrative position and is subject to chapter 84, but who does not qualify to be considered a firefighter within the meaning of section 8401(14), would so qualify if such employee had transferred directly to such position after performing duties described in section 8401(14)(A) and (B) for at least 3 years; and (IV) in the case of an employee who is not subject to subchapter III of chapter 83 or chapter 84, holds a position that the Office of Personnel Management determines would satisfy subclause (I), (II), or (III) if the employee were subject to subchapter III of chapter 83 or chapter 84; and (B) the term “qualified trade-of-time arrangement” means an arrangement under which 2 firefighters who are subject to the supervision of the same fire chief agree, solely at their option and with the approval of the employing agency, to substitute for one another during scheduled work hours in the performance of work in the same capacity.