What is the author's style in The Pugilist at Rest by Thom Jones?

The story is told by a first-person narrator who is a decorated Vietnam veteran and former Marine boxing champion. He now suffers from debilitating depression, for which he takes heavy doses of medication, and from epilepsy. At the end of the story, he agrees to undergo psychosurgery that may cure his condition but could also, he fears, ensure that he spends the rest of his life in an institution.