Section 30
SEC. 30. All officers of the National Guard shall be appointed and commissioned by the Commander in Chief after such physical and mental examination and such practical tests of efficiency as may be prescribed by rules and regulations. Officers shall hold their commissions at the pleasure of the Commander in Chief or until separated by resignation, retirement or desertion, or by sentence of a general court-martial or finding of an efficiency board. Non-commissioned officers of the staff corps and departments shall be appointed by the chief officer of their corps or department. Non-commissioned staff officers of regiments, battalions, and squadrons shall be appointed by the commanding officer of the regiment, battalion, or squadron to which they belong. Non-commissioned officers of companies and batteries shall be appointed on the recommendation of their company or battery commanders by the commanding officer of the regiment, battalion, or squadron to which they belong. All appointments of non-commissioned officers shall be by warrant and non-commissioned officers shall hold their positions at the will of the officer commanding them.