Section 591.401 - Purpose and applicability(a)Purpose. This subpart prescribes the regulations required by section 5942a f title 5, United States Code, to authorize payment of a separate maintenance allowance to assist an employee assigned to Johnston Island to meet the additional expenses of maintaining family members elsewhere who would normally reside with him or her because they cannot accompany the employee to Johnston Island. This subpart provides rules for determining which employees are eligible to receive the separate maintenance allowance, who qualifies as family members under the program, the method of payment, and payment amounts.(b)Applicability. This subpart applies to an employee (as defined in 5 U.S.C. 2105 ) in an executive department (as defined in section 101 f title 5, United States Code) or an independent establishment (as defined in section 104 f title 5, United States Code) who is assigned to a post of duty at Johnston Island.58 FR 51566, Oct. 4, 1993, as amended at 61 FR 27244, May 31, 1996