Massachusetts Constitution Pt. 2, Ch. II, § 1, Art. 10

ART. X. All military and naval officers shall be selected and appointed and may be removed in such manner as the general court may by law prescribe, but no such officer shall be appointed unless he shall have passed an examination prepared by a competent commission or shall have served one year in either the federal or state militia or in military service. All such officers who are entitled by law to receive commissions shall be commissioned by the governor.