Original U.S. Vietnam War Era “Blacked Out” HGU-26/P Flight Helmet with Dual Visor and Oxygen Mask by Sierra Engineering Japanese Marines as well as the washer

as well as the washer under the fuse

and white thread used in the design

with the original blue faded to a nice gray patina

most likely a Lieutenant in charge of a Company

this telescope could have seen service with an Officer in the Crimean War or even the U

Original U.S. Vietnam War Era “Blacked Out” HGU-26/P Flight Helmet with Dual Visor and Oxygen Mask by Sierra Engineering Japanese Marines as well as the washerOriginal Item. Only One Available. 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