645th Tank Destroyer Battalion
I now have available as pdfs the Bn Histories for Sept thru Dec 1943 and July thru December 1944.
I have the Histories for 1945 but have not yet scanned them.
In addition, I had found only two General Orders for the Bn at the NARA.
Both of them list the names of hundreds of men of the Bn who had been awarded the Good Conduct Medal in June and July of 1944.