S.D. Codified Laws § 33-4-9
Commissioned officers of the national guard shall take and subscribe to the following oath of office: "I, _______, do solemnly swear that I will support and defend the Constitution of the United States and the Constitution of the State of South Dakota, against all enemies, foreign and domestic; that I will bear true faith and allegiance to the same; that I will obey the orders of the President of the United States and of the Governor of the State of South Dakota; that I make this obligation freely, without any mental reservation or purpose of evasion, and that I will well and faithfully discharge the duties of the office of _______, in the National Guard of the United States and of the State of South Dakota, upon which I am about to enter, so help me God."
SDCL 33-4-9