Yvonne, you are looking for 121st Infantry Regiment, 8th Infantry Division, which landed in Normandy 3 July 44.
They entered combat 8 July 44, spending 260 days in action.
The division fought at Normandy, Northern France, Rhineland and Central Europe. He seems to have been away from the war following his wounding 8 Aug 44, preventing his participation in the last two of the listed campaigns.
The other unit IDs you list probabl;y pertain to his basic training units, none of which would have followed to the ETO.
Go to GOOGLE, enter <121st Infantry Regiment WW II> which brings up the quiry: DID YOU MEAN 121st IR ?; CLICK, scan down to fifth entry, 8th Infantry Division, CLICK, for the unit's complete military history.
I probably have specific information as to where he may have been at the time he was wounded.
I can't seem to connect with your site address as posted. Mind spelling it out for me?