Which piece of Japanese armor was once used to protect the heads of soldiers? This work has since been replaced by 21st century fighting gear. What the original armor is on display in the museum? This changed over time is an example of.
The piece of Japanese armor that was once used to protect the heads of soldiers is the kabuto, or samurai helmet. This armor is now replaced by modern helmets and headgear used by soldiers in the 21st century.
The original kabuto armor is on display in the museum as an example of the evolution of military technology and equipment over time. This change is an example of technological advancement and adaptation in warfare.