Section 1. Words used in this chapter shall have the following meanings, unless a different meaning is clearly apparent from the language or context:—

“Military forces of the commonwealth” shall include the organized militia as defined in section four, and members of the unorganized militia when drafted or accepted as volunteers under sections fifty-five and fifty-six.

“Enlisted person”, a member, other than a commissioned officer or a warrant officer, in the military forces of the commonwealth.

“Officer”, a commissioned officer or a warrant officer in the military forces of the commonwealth.

“Organization”, a command composed of two or more units.

“Unit” shall include headquarters, detachment, company, battery, troop, and equivalent air unit, and such other elements as may be determined by the commander-in-chief to come under such designation.

“Military custodian”, the senior military officer in command of troops stationed in an armory or air installation unless otherwise designated by the commander-in-chief.