The military Humvee is made by AM General Corporation in Mishawaka , Indiana. General Motors never had anything to do with the production of Humvees. In fact, AM General first marketed the civilian Hummer and then sold the brand to the suckers at General Motors. AM General built H1 and H2 Hummers on contract for General Motors, but has done no work for them since, maybe, January.
The current H3 shares nothing with the military Humvee.