Mike. The 84th Div. campaigns were Ardennes-Rhineland-Central Europe which matches your "Ardennes-Krefeld-Neckarelz"; they moved back from Germany to Belgium attached VII Corps on 22 Dec. In Jan. 45 the Division was located around Amonines then to Krefeld and on to Hanover.
There was a Concentration Camp at Neckarelz but not like Dachau etc., there were several "labour" sub-camps working on re-located Daimler-Benz aero engines for Heinkel-Messerschmitt. The Germans evacuated them in March so they weren't exactly "liberated"; the Neckar valley was occupied by US forces beginning early April. Incidentally there is a Memorial to the 3rd. US Armd. Div. at Amonines.
If you would like to see the Ardennes study including 84th Div. on "history.army.mil" you can PM me with your e-mail rather than on here as it's not strictly aviation-related.
Nick B. this is part of the Bad Aibling airfield you mentioned above, in May.
http://www.ibiblio.org/hyperwar/AAF/...-III-p744f.jpg
Regards
Nick K.