Military History Institute
Satisfactory info from USAMHI is the exception rather than the rule. Re the classication stamps that obliterate much of the info you receieved: everything was classified to one extent or another during the war. These cards should have been re-done immediately after the war (this could have been done easily and inexpensively but not at this late stage). You "lucked out" (your next request will probably be a disappointment).