Korean War Helmet Liner This original Korean War U.S. Westinghouse/Capac M1 helmet liner dates to 1951. It retains its original, albeit damaged, OD#7 (green) HBT suspension. This helmet liner would nicely complete a rear seam swivel loop helmet shell in equally worn condition, or serve as a great candidate for restoration. Use the larger picture option to view all the details of this item. Thanks for viewing a Circa1941 listing!