(a) An agency may detail or transfer an employee under this subpart, without prior approval, to an organization which the Department of State has designated as an international organization.

(b) An agency may detail or transfer an employee under this subpart to any other public international organization or international organization preparatory commission only when the Department of State agrees that the organization concerned could be designated as an international organization covered by sections 3343 and 3581 of title 5, United States Code.