Upon the requisition of the president of the United States, and in case of war or invasion, or to prevent insurrection or invasion, the commander in chief may call out from time to time, for the actual service, by draft or otherwise as many of the entire national guard as the necessity of the case requires. The enrolled national guard, when so ordered for preparation for actual service, shall be administered and trained according to the laws of this state and of the United States. On the termination of the emergency all persons discharged from the military service who were, upon draft into federal service, members of the national guard of Vermont shall resume their membership in the national guard, and shall continue to serve in the national guard until the dates upon which their enlistments prior to their draft would have expired if uninterrupted. (Amended 1973, No. 223 (Adj. Sess.), § 9, eff. April 4, 1974.)