The flag of the state shall be pennant shaped. It shall have three red and two white horizontal stripes. The union of the flag shall be seventeen five-pointed stars, white in a blue triangular field, the base of which shall be the staff end or vertical edge of the flag, and the apex of which shall be the center of the middle red stripe. The stars shall be grouped around a red disc superimposed upon a white circular "O." The proportional dimensions of the flag and of its various parts shall be according to the official design on file in the office of the secretary of state. One state flag of uniform dimensions shall be furnished to each company of the organized militia.