; and (B) the Secretary of the Interior and the Secretary of Agriculture shall use the wildland firefighter occupational series developed under paragraph (1) in the advertising and hiring of a wildland firefighter. (b) Hazardous duty differential not affected Section 5545(d)(1) of title 5, United States Code, is amended by striking except and all that follows and inserting the following: except— (A) an employee in an occupational series covering positions for which the primary duties involve the prevention, control, suppression, or management of wildland fires, as determined by the Office; and (B) in such other circumstances as the Office may by regulation prescribe; and . (c) Current employees Any individual employed as a wildland firefighter on the date on which the occupational series established under subsection (a) takes effect may elect to— (1) remain in the occupational series in which the individual is working; or (2) be included in the wildland firefighter occupational series established under subsection (a).