The head of each principal department shall be a single executive unless otherwise provided by law. He shall be appointed by the governor, subject to confirmation by a majority of the members of the legislature in joint session, and shall serve at the pleasure of the governor, except as otherwise provided in this article with respect to the secretary of state. The heads of all principal departments shall be citizens of the United States. Editor’s Note. Senate Joint Resolution No. 2, “changing the name of the secretary of state to lieutenant governor” in 16 sections of the Alaska Constitution, approved by the voters August 25, 1970, inadvertently omitted express amendment of this section.