Drafted that year, Casey became a military policeman in Fort Leonard Wood, Missouri, and later in Landing Zone Bayonet, Quang Ngai Province, Vietnam, with the Americal Division. The journal of his military experience became the book,Obscenities, published in 1972 by the Yale University Press. His book, Millrat, on blue collar work in a textile mill dye house has been published by Adastra Press. Casey taught for many years at Northern Essex Community College in Haverhill, Massachusetts.