My friend Ronald Stassen sent me these images. Doing some research this morning. There were attached to the Third Army.

Marion J Chard
Proud Daughter of Walter 'Monday' Poniedzialek
540th Combat Engineer - H&S Company
Marion J Chard
Proud Daughter of Walter 'Monday' Poniedzialek
540th Combat Engineer - H&S Company
Lineage And Honors Information
Looks like they had a hand in printed many books in Europe including a book I have regarding my dad's unit called, The 540th Regiment in France - George W Marvin, Commanding. I received a copy of this book years ago from the Engineer Office of History.
Guess there is also a book on the history of the 667th - but it would be difficult to locate.
Bruno Caneva - a history
This link shows they were attached to the 244th for a period of time (9th Army)
The following link is a book on the 9th Army and again, shows the 667th listed
Marion J Chard
Proud Daughter of Walter 'Monday' Poniedzialek
540th Combat Engineer - H&S Company