22 CFR 172.2 - Service of summonses and complaints.
(a) Only the Executive Office of the Office of the Legal Adviser (L/EX) is authorized to receive and accept summonses or complaints sought to be served upon the Department or Department employees. All such documents should be delivered or addressed to: The Executive Office, Office of the Legal Adviser, Suite 5.600, 600 19th Street NW., Washington DC 20522. (Note that the suite number is 5.600.)
(b) In the event any summons or complaint described in § 172.1(a) is delivered to an employee of the Department other than in the manner specified in this part, such attempted service shall be ineffective, and the recipient thereof shall either decline to accept the proffered service or return such document under cover of a written communication which directs the person attempting to make service to the procedures set forth herein.
(c) Except as otherwise provided §§ 172.2(d) and 173.3(c), the Department is not an authorized agent for service of process with respect to civil litigation against Department employees purely in their personal, non-official capacity. Copies of summonses or complaints directed to Department employees in connection with legal proceedings arising out of the performance of official duties may, however, be served upon L/EX.
(d) Although the Department is not an agent for the service of process upon its employees with respect to purely personal, non-official litigation, the Department recognizes that its employees stationed overseas should not use their official positions to evade their personal obligations and will, therefore, counsel and encourage Department employees to accept service of process in appropriate cases, and will waive applicable diplomatic or consular privileges and immunities when the Department determines that it is in the interest of the United States to do so.
(e) Documents for which L/EX accepts service in official capacity only shall be stamped “Service Accepted in Official Capacity Only”. Acceptance of service shall not constitute an admission or waiver with respect to jurisdiction, propriety of service, improper venue, or any other defense in law or equity available under the laws of rules applicable for the service of process.