It appears the battalion was assigned to I Corps and attached to 191st Field Artillery Group just prior to the landings at Lingayan Gulf, Luzon. "Debbie" is the daughter of a staff officer of Group Headquarters and she has all his papers - General- and Special Orders, after-action reports, etc. Her e-mail is blocked so you'll have to contact her by posting a reply to Message #11882 of 9/3/03.
At the main page of this forum, enter "11882" in the box in the upper right corner marked "Jump to . . " then click on "Go"
I found nothing regarding a battalion veterans' association. You may be too late on that account. There may be a 191st vets' association. Ask Debbie or check around the 'net.