Original U.S. Vietnam War US Navy Pilot Dual Visor APH-6C Flight Helmet by Sierra Engineering Co. with Oxygen Mask - Dated 1971 ZB 26-ZB 30 The accomplishment of building the

The accomplishment of building the Ledo Road stands as a testament to the men responsible and the American spirit that made it possible

for the famous Birmingham-based gunmaker after 1806

started the next series of numbers

The WC maker code stands for Hasag

The soldiers within the 59th came from a wide variety of different occupations

Original U.S. Vietnam War US Navy Pilot Dual Visor APH-6C Flight Helmet by Sierra Engineering Co. with Oxygen Mask - Dated 1971 ZB 26-ZB 30 The accomplishment of building theOriginal 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