15-701.03. Graduation requirement; constitutional oath

Beginning in the 2013‑2014 school year, In addition to fulfilling the course of study and assessment requirements prescribed in this chapter, before a pupil is allowed to graduate from a public high school in this state, the principal or head teacher of the school shall verify in writing that the pupil has recited the following oath:

I, _________, do solemnly swear that I will support and defend the Constitution of the United States against all enemies, foreign and domestic, that I will bear true faith and allegiance to the same; that I take this obligation freely, without any mental reservation or purpose of evasion; and that I will well and faithfully discharge these duties; So help me God.

How can the oath be taken freely if they withhold your diploma without it?