Colorado constitution
Article XII
Section 15

(7) This section shall be in full force and effect on and after July 1, 1971, and shall grant veterans' preference to all persons who have served in the armed forces of the United States in any declared or undeclared war, conflict, engagement, expedition, or campaign for which a campaign badge has been authorized, and who meet the requirements of service or disability, or both, as provided in this section. This section shall apply to all public employment opportunities, except as set forth in subsection (5) of this section, conducted on or after such date, and it shall be in all respects self-executing.