the  microphone and its arm ,chin strap is all intact with perfect condition . no way to test it .

The Vietnam War US Army T56-6 Combat Tanker Tank Vehicle Crew Helmet by Sierra Co. is an authentic and original piece of militaria from the Vietnam War era. This helmet, with its unique design and historical significance, offers collectors the opportunity to own a tangible piece of the conflict. Made in Vietnam, it embodies the craftsmanship and materials used by the US Army during that time, making it a valuable and sought-after item for enthusiasts of military history.

Shipment worldwide.

Thanks