The Governor shall, when ordering out the unorganized militia, designate the number. He may order them out either by call for volunteers or draft. The unorganized militia may be attached to the several organizations of the National Guard or Naval Militia, or organized into separate divisions, brigades, regiments, battalions, companies, or detachments as the Governor may deem best for service. He shall appoint the commissioned officers and warrant officers in the same manner as provided in this chapter for the appointment of officers and warrant officers of the National Guard and Naval Militia.