Pretty high. My cousin was a 68w and he went to Germany three separate times. Germany has one of the largest medical facilities in Europe and is often the first place injured personnel get sent for treatment.
Combat Medic is almost a guaranteed trip to the middle east. Still, there are combat hospital units in Germany and they need medics.
Many Years ago when I enlisted in the Army, a volunteer could make duty assignment a provision of enlistment. They had to send you to the duty post agreed to on the enlistment contract, or give you a discharge.
The Army's out was they would send someone to Germany for a week, and then transfer them to somewhere else and they met the duty assignment provision of the enlistment contract. Some guys never got out of the replacement company, they reported in and a week later cleared post for their next duty post.