Donald William Hoock - 197th anti aircraft artillery, automatic weapons battalio

I am looking for information on my father Donald William Hoock, who was a member of 197th anti aircraft artillery, automatic weapons battalion under Lt. Col. C.T. McEniry 197th A.A. B.N. Headquarters.My father had a jeep nicknamed after him called "Hoock's Headache" .On December 27th, 1944 he received a purple heart.I would like to know ownhis injury occurred as it required a metal plate to be placed in his head, from what I am told.My mother Dorothy Jean Busby Hoock said at a reunion of the 197th, three guys came up and said they would not have been alive if it had not been for my father.Dad never wanted to talk about the war but he often slept with his eyes open.I have many pictures that he took from areas he was in including many of the Buchwald Concentration Camp, he arrived at shortly after the liberation .I would appreciate any information anyone has on my father. He was stationed at Ft. bliss, Tx before deploying and was born in Rochester, NY.He also received a bronze star.We have both the purple heart and bronze star.He was on the beach at Normandy and in the battle of the bulge .