A commissioned officer of the National Guard shall take 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 Maryland, 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 Maryland; that I take 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 Maryland upon which I am about to enter, so help me God.”