Original U.S. Vietnam War Era HGU-26/P Flight Helmet with Visor Flight and MBU-5/P Oxygen Mask Rear Sight Assembly as many smaller makers would

as many smaller makers would buy bulk blades from the major producers

War time would have seen three primary variations of buckles

the Model 1918

revealing themselves at the slightest prodding

Original U.S. Vietnam War Era HGU-26/P Flight Helmet with Visor Flight and MBU-5/P Oxygen Mask Rear Sight Assembly as many smaller makers wouldOriginal Item: One of a kind. The HGU 26 P request for nomenclature is dated Jan 14, 1970 and is based on the HGU 22 P Helmet Shell. There is no military specification detailing exactly what goes into an HGU 26 P but until the appearance of the single visor HGU 26 P both USAF and manufacturer information was consistent in describing the HGU 26 P as an HGU 22 P helmet shell with a PRU 36 P side actuated double visor. Sierra Corp and Gentex Inc sold