Original U.S. Vietnam War US Navy Pilot Dual Visor APH-6CMSI Flight Helmet by Sierra Engineering Co. with Original Early “Bowling Ball” Bag Breda M-37 As time went on even

As time went on even NCOs were able to use minimalized examples

the "Buffalo" (American Bison)

17) where the Spartans wrote their names on sticks tied to their left wrists

There are traces of the original "Naval Engagement" engraving on the cylinder

and have not been "swapped out" over the years

Original U.S. Vietnam War US Navy Pilot Dual Visor APH-6CMSI Flight Helmet by Sierra Engineering Co. with Original Early “Bowling Ball” Bag Breda M-37 As time went on evenOriginal Item: Only One Available. At the end of the 50's the APH series helmets introduced a new generation of flight helmets characterized by the external visor covered with a protective shield. Improvement of the communication system, internal liner and oxygen mask retainers was also made and in some versions the dual dark and transparent visors system was installed. These types of helmets were the US Navy and USMC standard jet aircraft headgears