In time of war no elector in the military service of the State or in the armed forces of the United States shall be deprived of his vote by reason of absence from his election district. The Legislature may provide for absentee voting by members of the armed forces of the United States in time of peace. The Legislature may provide the manner in which and the time and place at which such absent electors may vote, and for the return and canvass of their votes in the election district in which they respectively reside.