Erwin served in the army two years during the Korean Conflict (1952-1953). Starting in 1973, he became heavily active in South Hutchinson and it's various committees and boards. Erwin served as chair of the South Hutchinson Pride program from 1973-1982. In 1977 he was elected to the South Hutchinson City Council until 1981 and later served three additional terms from 1985-1989, 1995-2011, and finally in 2013 where he still resides. He then became a board member of the South Hutchinson Planning board in 1989 and served as chairperson from 1991-1995. Over the years, Erwin has served seven one-year terms as mayor of South Hutchinson. He is currently the President of Market South Hutchinson and serving as secretary and treasurer of the Reno County Veterans Association.