5 CFR § 575.303 - Eligible categories of employees.
(2) A senior-level or scientific or professional position paid under 5 U.S.C. 5376;
(4) A position as a law enforcement officer, as defined in 5 CFR 550.103;
(5) A position under the Executive Schedule paid under 5 U.S.C. 5311-5317 or a position the rate of pay for which is fixed by law at a rate equal to a rate for the Executive Schedule;
(6) A prevailing rate position, as defined in 5 U.S.C. 5342(a)(3); or
(b) Except as provided in § 575.304, a legislative agency may pay a retention incentive to a current employee who holds a General Schedule position paid under 5 U.S.C. 5332 or 5305 (or similar special rate authority).