U.S. Army T-56-6 Combat Vehicle Crewman (CVC) "Tanker" Helmet Vietnam War era.

Model: T-56-6 Helmet Shell. This was the outer ballistic shell designed to protect the wearer from fragments and bumps inside a moving vehicle. The rough, textured olive drab paint is characteristic of this model and era. Purpose: Combat Vehicle Crewman (CVC). This helmet was not issued to infantry but specifically to soldiers operating tanks (like the M48 and M60 Patton), armored personnel carriers (like the M113), and other armored vehicles. Era: Vietnam War. While the design originated in the late 1950s, this helmet is synonymous with the Vietnam War and was in service for many years. Communication System: The most telling feature is the integrated electronics. The helmet is essentially a platform for a communications headset. Microphone: The close-up of the connector piece with the marking M-138/G is a definitive identifier. This is the standard designation for the dynamic microphone element used in these CVC helmets and other military communication systems of the period. He