251.72—Physical hardship or hazard differentials for non-manual positions.
The head of each agency, in coordination with the heads of other agencies, may authorize payment of differentials for positions, other than positions subject to § 251.71 of this chapter, to compensate for irregular or intermittent duty involving unusual physical hardship or hazard. Differential prescribed under this section shall generally conform to regulations published in 5 CFR Part 550.