M1 Helmet Steel WWIIThe M1 helmet is an iconic piece of military equipment and is a combat helmet that was used by the United States' military forces from World War II until 1985. The M1 helmet was adopted by US military forces in 1941 to replace the outdated World War I era British style Brodie helmet. The M1 helmet is a combination of two layers of "one size fits all" helmetsthe first being an outer metal shell, sometimes called the "steel pot", and the second being a