With annual revenues of more than more than $2 billion, Day & Zimmermann has been recognized by Forbes as one of the largest private companies in the United States. The company has a work force of over 20,000 employees in nearly 150 locations worldwide. Founded in 1901, Day & Zimmermann serves more than 1,300 customers, including several Fortune 100 companies. It provides architecture, engineering, procurement, contract maintenance, project management, and design and build services. The company also offers logistics, life support, facility management, and equipment operation and maintenance solutions to the Department of Defense and other government agencies. Day & Zimmermann additionally provides security, outsourcing and validations services, as well as manufactures, stores and demilitarizes ammunition products.