What are my options after the Army sent me to a different duty station than what was specified in my reenlistment contract?

Reenlisted for six years for Germany while I was in Afghanistan, roughly two years ago. Germany is specified in the contract. Hit red tape when out-processing, wife couldn't go. NBD, I could standby to fix the paperwork or take another assignment. I kept my options open. Ret. NCO had me name three places I'd like to go if I couldn't get Germany to work. None of the top three options were available (purportedly) and without any confirmation from me, I got put at Fort Knox, and was told I could not say no as the orders were already cut; one meeting I was naming places I would go if I couldn't fix my paperwork for my wife, and the next meeting I had orders. Was this a breach of contract?
Been trying to make the best of it but since then, my faith in the Army has greatly eroded.
Is this a breach of contract, and if so, would I be able to either get into another unit before my three years here, or perhaps separate from the Army? Even Fort Couch would be preferable over this current unit.
Any insight would help, I'm really struggling with this here; I wouldn't be asking to get out of this unit if it was going great. Thanks.