Headwarp (Vietnam War era) Tuesday July 26th, 2016 admin The Vietnam War, Hat, Cap & Balaclava 10,488 views Shown one contract number dated 1972. Used by doctors and nurses in the field hospital. Stock Number Reference: Headwarp FSN: 8340-577-4168 (Same as Tent shelter half) Assign Date: Unknown vietnam_warog107headwarp