Ohio Rev. Code § 709.01: Annexation and detachment of territory.

Territory may be annexed to, merged with, or detached from, municipal corporations, in the manner provided in this chapter, provided that no territory lying within the boundaries of a military base, camp, or similar installation under the jurisdiction of a military department of the United States government, that is used for the housing of members of the armed forces of the United States and is a center for military operations of the department shall be annexed to or merged with a municipal corporation under this chapter without the approval of the secretary of defense of the United States, the secretary's designee, or other person having authority under federal law to give such approval.