From the Ohio 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. 

(As amended Nov. 7, 1961.) 


From the Ohio Revised Code:
5923.01 Composition and organization of state militia; definitions; troop limitation. 

   (A) The Ohio organized militia consist of all citizens of the state who are not 
   permanently handicapped, as handicapped is defined in section 4112.01 of the 
   Revised Code, who are more than seventeen years, and not more than sixty-
   seven years, of age unless exempted as provided in section 5923.02 of the Re-
   vised Code, and who are members of one of the following:
   (1) The Ohio national guard;
   (2) The Ohio naval militia;
   (3) The Ohio military reserve.
   (B) The Ohio national guard, including both the Ohio air national guard and 
   the Ohio army national guard, the Ohio naval militia, and the Ohio military 
   reserve are known collectively as the Ohio organized militia.
   (C) The Ohio naval militia and the Ohio military reserve are known collec-
   tively as the state defense forces.
   (D) The unorganized militia consists of those citizens of the state as de-
   scribed in division (A) of this section who are not members of the Ohio 
   organized militia.
   (E) No troops shall be maintained in time of peace other than as authorized 
   and prescribed under the "Act of August 10, 1956," 70A Stat. 596, 32 U.S.C.
   A. 101 to 716. This limitation does not affect the right of the state to the use 
   of its organized militia within its borders in time of peace as prescribed by the 
   laws of this state. This section does not prevent the organization and mainte-  
   nance of police.