What were the names of the servicemen in Aleutian Islands from 1942-1945 from th US Army?

My granfather Peter Jagunich was orignaly stationed on Kodiak Island of Alaska when he was sent to Attu and Kiska. He was selected for his winter survial skills. Many American and Canadian service men were unable to fight becase of the lack of cold weatehr survial skills. Many of he native Alaskans, Norther Candians and North Mid-West Americans had no problems addapting to the suroundings.