Outside Union Station, with his mobile hairdressing gear in his backpack — a gown, razor, comb, some clips and scissors — Coombes came upon Thomas, a 70-year-old Vietnam veteran who has been homeless for 10 years. “I could never have seen it,” he told Coombes. “Hell, when I was in the Army, there’s no way I could have pictured being here. But life can lead you to unexpected places.”