About Day And Zimmermann. At our Day & Zimmermann Munitions Plants, we know the stakes and We do what we say. ® We’re the team working behind the scenes to make sure our nation’s front lines have safe, high-quality ammunition. As a trusted premier manufacturer of ammunition to the U.S. Military, some of our capabilities range from production of direct and indirect fire, components, to special projects and beyond. With more than 120 years of exper...
