No officer or enlisted person of the armed forces of the commonwealth, not on leave of absence, shall be excused from duty if ordered to duty under section 38, 40 or 41 except upon a physician's certificate of disability.
Mass. Gen. Laws ch. 33, § 47
Excuse from duty upon physician's certificate of disability
Official source: Massachusetts Legislature. Reproduced from public-domain Massachusetts statutes; confirm against the official source for the current text. Not legal advice.