The Indiana National Guard is supported by the state's military defense force, the Indiana Guard Reserve, which is part of the Military Department of Indiana. The Indiana Guard Reserve is a supplemental military force authorized by both the State Code of Indiana and Executive Order. The Indiana Guard Reserve (IGR) assumes the state mission of the Indiana National Guard in the event the Guard is federally mobilized.. The IGR is subject solely to the orders of the Governor and is commanded by the Adjutant General of Indiana.