Thomas was born Dec. 26, 1950, in Rock Island, Illinois, to the late John and Betty Dugan.
He is survived by his wife of 48 years, Margaret “Peggy” Dugan; a daughter, Karrie (Alan) Ring; two sons, John (Jennifer) Dugan and Michael Dugan; a sister, Mary D. Seymour, of Delmar; and a niece, Audra Martin, of Zwingle.
He was preceded in death by his parents, and a brother-in-law, James Seymour.
Services will be held at the Rock Island Arsenal in Illinois at a later date. Pastor Jim Corbitt (US ARMY Ret.) will officiate.