US Army M1 Helmet Liner Military Police Air Defence Artillery School

The US Army M1 Helmet Liner Military Police Air Defence Artillery School is a component of the standard-issue M1 helmet used by American forces from World War II through the 1980s. This liner was designed to fit inside the steel M1 helmet shell, providing additional comfort and stability for the wearer. Constructed from high-pressure molded fiber or thermoplastic materials, the liner features an adjustable suspension system. This example is designated for Military Police and personnel associated with the Air Defence Artillery School, as indicated by the distinct insignia or markings present on the liner’s exterior. Such liners were commonly used in training and ceremonial contexts, as well as for specific duty assignments. The liner includes standard fittings such as webbing, sweatband, and chinstrap attachments. Items of this type illustrate the role of specialized units within the postwar US Army and demonstrate the evolution of personal protective equipment during the mid-20th century.