This is a U.S. M-1 Westinghouse liner from WWII (1939-1945). It has unit insignia on the sides from the 3rd Armored Cavalry Regiment, the Brave Rifles. The dark green liner is missing the sweatband and neckband, though the suspension is mostly intact.

Country: United States	War Period: World War II
Garment Type: Infantry Helmet	Year Made: 1942 — 1988
Manufacturer: Westinghouse Electric and Manufacturing Company
Identification: USH-578-0312