Each member of the City Council and of every board and commission and each officer, department head and full-time employee, before beginning the duties of the office, shall take, subscribe to and file with the City Clerk the following oath or affirmation:

“I do solemnly swear (or affirm, as the case may be) that I will support the Constitution of the United States and the Constitution of the State of California; that I will, in all respects, observe the provisions of this Charter and the ordinances of the City of Chula Vista; that I will faithfully discharge the duties of the office of (here inserting the name of office) according to the best of my ability; and that I do not advocate the overthrow of the government of the United States by force or violence.”