Estonia - 1992 Constitution

Title Article 125
Chapter 10 - National Defense
Article

125

A person in active service may not hold elected or appointed office nor participate in the activities of any political party.

Categories - Extra-parliamentary party (Members' compatibility)
Source Gisbert H. Flanz ed. 2004. Constitutions of the Countries of the World. Dobbs Ferry, New York: Oceana Publications.