Seeking after action reports or morning reports of the 9th infantry and 645 TD battalion

I am trying to get details of what unit my grandfather was attached to or belonged to  when he was wounded on March 14 1945 during the battle  of Remagen. His enlisted record states he was with the 645th Tank Destroyer  Battalion  but his separation qualification record  described him as Rifelman  as a member  of the 9th. Infantry Division. He talked about the battle of the bulge and during the Ludendorff  bridge battle his commander had the stop and pray before the crossed.