now that I refer to your divison patch site it must be the 7th. Is this correct?
Parker,
Yep. 7th Infantry Division. It does appear to be that. At first you said it was subdued and I was thinking Viet Nam era patch. But this is either a colorized photo or a faded color photo and so the colors can be off by quite a bit. Old faded photos tend to loose their red pigment or for more modern photos they can lose their Blue.
Now try to ask around and see if you can find old letters or such that would give more clues to his exact unit. You will be surprised that some relative will have a letter stuffed away somewhere.
Last weekend, my aunt showed me 5 "undiscovered" letters from her husband---2 of them were sent from Stalag IIb. The letters were sent to his brother and had been in their posession.
Those distant Aunts are good at saving old clippings but they also are slow to find them and show them to others. 
Steve