§ 6-a. Organizations and volunteers from the unorganized militia. To the extent permitted by the constitution of the United States, the governor may, at any time, order, authorize or recognize such organizations of the unorganized militia, or of designated classes thereof, or of volunteers therefrom, as he may deem to be for the public interest, and may prescribe therefor such parts of the regulations governing the organized militia as may be applicable thereto or establish such regulations therefor, or both, as he may deem proper. The governor may, at any time, provide for the separate organization, or authorize the enlistment in organizations of the unorganized militia, of persons volunteering for such service, not otherwise subject to military duty under section two of this chapter.