Each and every member joining the state guard shall, in addition to the oath required by law to be taken by officers, take and subscribe to the following oath: “I do solemnly swear that I will well and faithfully perform my duties as a member of the Tennessee state guard to the best of my ability, and I do solemnly swear that I will bear true faith and allegiance to the state of Tennessee and that I will serve the state of Tennessee honestly and faithfully against all enemies, whomsoever, and that I will obey the orders of the governor and the officers placed over me, according to law.”