5 CFR 352.305 - Eligibility for detail.
An employee is eligible for detail to an international organization with the rights provided for in, and in accordance with, section 3343 of title 5, United States Code, and this subpart, except the following:
(a) A Presidential appointee (other than a postmaster, Foreign Service officer or a Foreign Service information officer), regardless of whether the appointment was made by and with the advice and consent of the Senate.
(b) A person serving in the executive branch in a confidential or policy-determining position excepted from the competitive service under Schedule C of part 213 of this chapter.
(c) A person serving under a non-career, limited emergency, or limited term appointment in the Senior Executive Service (SES).
(d) A person serving under a temporary appointment.