It isn't much, but the obliterated part of your record... EA..., would stand for: European African Middle East Campaign, which would cover lots of military action.
You refer to the Ardennes-Alsace Campaign and the Central Europe Campaign.
The Bulge covered the period 16 Dec 44 / 24 Jan 45 Central Europe covered 22 Mar 45 / 11 May 45.
There were three other campaigns in ETO:
Normandy, 6 Jun 44 / 24 July 44 Northern France, 25 July 44 / 14 Sept 44 Rhineland, 15 Sept 44 / 11 May 45.
Since you do not list the last three campaigns, I would assume that your father, S/S Dennis Johnson, joined the 5th ID as a replacement for the Ardennes operation, then was a carry-over for Central Europe .