From the Ohio State Constitution:

Article IX 1 Who shall perform military duty.

All citizens, residents of this state, being seventeen years of age, and under the age of sixty-seven years, shall be subject to enrollment in the militia and the performance of military duty, in such manner, not incompatible with the Constitution and laws of the United States, as may be prescribed by law.

That's right. If you are over seventeen and an citizen/Ohio resident, you are, by law, a member of the elite Ohio militia. Anyone up for attacking Indiana? :)