Mass. Gen. Laws ch. 33, § 32: Discharge or retirement for disability

Section 32. The commander-in-chief may order any member of the military forces of the commonwealth before a medical board, consisting of at least 3 medical officers, and if the board reports such member of the military forces of the commonwealth to be physically unable to perform the assigned military duties, the commander-in-chief may order the member of the military forces of the commonwealth discharged or placed on the retired list.