(a) When an employee of the Government is on duty, or is transferred or assigned to duty, at a place designated by the head of the agency concerned as inside a zone

because of military or other reasons which create imminent danger to life or property, or adverse living conditions which seriously affect the health, safety, or accommodations of the immediate family, Government funds may be used to transport his immediate family and household goods and personal effects, under regulations prescribed by the head of the agency, to a location designated by the employee. When circumstances prevent the employee from designating a location, or it is administratively impracticable to determine his intent, the immediate family may designate the location. When the designated location is inside a zone to which movement of families is prohibited under this subsection, the employee or his immediate family may designate an alternate location.

(b) When the employee is assigned to a duty station from which his immediate family is not excluded by the restrictions in subsection (a) of this section, Government funds may be used to transport his immediate family and household goods and personal effects from the designated or alternate location to the duty station.