Okay, I DO know who you are now. 
Well it's great to have you here, and I hope we will see each other next year again. It was a real honor being able to attend, and meeting so many of the veterans from the 157th, and of course their families.
NARA can be flabbergasting, but you can write a letter directly to them, and ask for any unit papers on the 157th. Give them the dates in question (from time departed overseas, until the unit was sent home), giving as much detail as possible, so they can narrow the search. They will write back and tell you what they found. You can then decide what you want. It takes them approximately 3-6 weeks for an answer.
National Archives at College Park
8601 Adelphi Road
College Park, MD 20740-6001
Another SUPER source is the Army Corps of Engineers' Office of History. Simply email, call or write to them, and request any information on the 157th during WWII. I also followed that route, and in fact, it was my first and main source of information when I began my research.
It worked great for me!
If you have any questions, don't hesitate to ask me.
All this is listed in my research section:
http://www.6thcorpscombatengineers.com/eng...hp?showtopic=23
Smiles,
M1
Proud Daughter of Walter (Monday) Poniedzialek
540th Engineer Combat Regiment, 2833rd Bn, H&S Co, 4th Platoon
There's "No Bridge Too Far"