That's interesting info, Todd. I've read a lot of military history and this is the first time I've ever heard of that unit. I'll have to do some research - will also try to get hold of the book you're reading.
My grandpa was a heavy machine gunner(.30 cal) in the 6th army, 158th RCT, 43rd Div, Company M(at one time he was with company L). He received a purple heart(with a cluster, was wounded 2 times), CIB(combat infantry badge) Philipphine Liberation medal(with a bronze arrow), plus a couple more ribbons for WW2 victory, good conduct, ect... I don't have his seperatino papers in front of me. I do have the ribbons and purple heart as well.
He fought in New Guinea, Bismark Archipelago, Luzon/Phillipines and was part of the occupation forces in Japan. I have his scrapbook with various photos, boot camp and related photos and info. He trained at Fort Ord and Camp Roberts before being assigned to the 158th Bushmasters RCT. I also have a japanese sword that he took off a dead japanese.
I was always very close to him before I went into the Navy in 1984, he died Dec. 14th, 1986. I never knew any of his story though and I am just now getting the full picture of what he did in WW2. I wish I could have talked to him about it, he might not have talked about it as most vets don't, but it would have been nice to try. From an article that is in the scrapbook from "Yank" magazine he had a paragraph circled and I can see why he decided to not talk about his time in WW2. I am going to try and post the circled article here:
Yank article.jpg
Here is there shoulder patch that they wore as well:
158th patch.jpg
Here are a couple website's that have some info on the 158th RCT :
http://www.bushmasters158.com/
http://bushmaster.vibobgen.com/