22 U.S.C. § 4022

(a) In general The Secretary shall establish foreign language proficiency requirements for members of the Service who are to be assigned abroad in order that Foreign Service posts abroad will be staffed by individuals having a useful knowledge of the language or dialect common to the country in which the post is located. (b) Training The Secretary of State shall arrange for appropriate language training of members of the Service by the institution or otherwise in order to assist in meeting the requirements established under subsection (a).