Mass. Gen. Laws ch. 6, § 15OOOOOO

The governor shall annually set apart June 14, the anniversary of the founding of the United States Army, in recognition of the distinguished patriotic services rendered by that organization, and by the citizens of the commonwealth who so gallantly served, and shall issue a proclamation recommending that the day be observed by the people in the display of the flag and in appropriate public exercises, commemorative of the services and sacrifices of the citizens of the commonwealth who have served and continue to serve in the defense of the United States.