Day & Zimmermann's government facilities and operations experience dates to the design, construction and operation of the Iowa Army Ammunition Plant prior to and during World
War II. 

Day & Zimmermann companies today hold contracts for the operation of the 15,699-acre Lone Star Army Ammunition Plant (awarded in 1951), the 13,727-acre Kansas Army Ammunition Plant (1970) and Hawthorne Army Depot (1980), the largest ammunition depot in the world, encompassing more than 230 square miles

Day & Zimmermann has successfully operated vast complexes for more than 50 years, providing our customers with full-service facilities management that includes base operations, equipment management, environmental services, housing management and security.