Do soldiers spend their time with a single unit during duty?

normal duty ignments last about 2 years. however you can end up stuck in the same unit for your enlistment, one of the people i work with has been in the same unit for 6 years, were at ft bragg, its the black hole of the army, once you come here, u just might be stuck here. you can also reenlist for stabalization in your unit, or to go somewhere else.