Well, you are in for some good news because I know several members of the 39th Combat Engineering Regiment. I will be happy to put you in touch with the families. I have names, addresses and email addresses.
In fact I just received an oral interview that David Wagner sent me three days ago. It's a two CD set and I can't wait to get sometime later this week to give it a listen. David also has a page on our site and do several other members of the 39th.
Here is a story regarding John Wack. Sorry to say that he recently passed away in December. I was only able to speak to him on the phone just once about 10 months ago. 
http://www.landminesurvivors.org/survivors...person.php?id=8
I will send you an email later today with more information. Welcome aboard and I hope I can help you out. Please don't hesitate to contact me at anytime. 
Proud Daughter of Walter (Monday) Poniedzialek
540th Engineer Combat Regiment, 2833rd Bn, H&S Co, 4th Platoon
There's "No Bridge Too Far"