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 started the next series of

started the next series of numbers

which has made them smaller than the grip frame

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

The WC maker code stands for Hasag

which would propel the bomb out of the tube

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 started the next series ofOriginal 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