There are many documented cases of soldiers refusing to have their wounds, which they consider to be minor, awarded a ribbon, after seeing what their fellow soldiers have endured. Also, it is possible that there was no officer or NCO around to document the injury.
The Bulge was an increadibly chaotic and hectic battle, and most barely survived, so paperwork was not as big a concern to anyone at the time.
I have respect for ALL who served, both abroad and at home.
-Troy