Your "medal" is the regimental crest - distinctive insigne, if you will - of the 383d Infantry Regiment, an organic element of 96th Infantry Division. "DEPENDABLE" is the regimental motto. The regiment fought at Leyte (where he was injured [wounded?]) and Okinawa.
You may be able to contact former buddies through the divisional veterans association:
96th Infantry Division Association 7634 Fielding Avenue Detroit, Michigan 48228-3232
Ask whether there's a regimental veterans association. If so, they can give you the address.