Helmets date back to ancient times. Primitive people used coconut shells, armadillo shells, tortoise shells and other fibers to protect their heads, which were used for hunting wild animals and fighting. To stop the attack. Later, with the development of metallurgical technology and the need of war, the metal head was invented.

Helmet. The earliest metal helmet abroad was a bronze helmet made around 800 BC. The bronze helmet of Shang Dynasty unearthed from Yin Ruins in Anyang, China, has a history of more than 3,000 years, with animal face patterns cast on the front, which can cover people's left and right ears and neck. It can be said that the bronze helmet of Yin Ruins is the earliest metal helmet in the world.

17 ~ 18 century, with the appearance of hot weapons such as pistols and rifles, bronze helmets basically lost their protective function, and people had to seek new helmet materials. During the First World War, the French army first developed a helmet that can prevent the shells from breaking, which is the "Adrian" helmet. It's really an interesting story: in World War I, the extensive use of machine guns and artillery brought great casualties to unprotected combatants, and both sides were helpless about flying shrapnel. One day, a French soldier was on duty in the kitchen Suddenly, German artillery shells hit, and suddenly smoke filled the air, and shrapnel flew everywhere. In order to protect his head, the soldier put a pot on his head in desperation, and the result was really effective. The shrapnel flying in the air hit the iron pan and bounced off one by one. The iron pot saved the soldier's life. Later, a general named Adrian learned about it and was very inspired. He immediately ordered the development of a metal helmet with bulletproof sheets. This helmet is made of Hart stainless steel, so it is also called a helmet. In the first world war, the American and British troops were also equipped with this helmet weighing about 0.5 ~ 1.8 kg. Although the helmet at that time only had a metal shell and padding, it was the prototype of modern helmet. In World War II, the United States developed manganese steel helmets such as M 1, which greatly improved the protection ability. However, weapons are constantly developing, their lethality is constantly increasing, and the killing effect of light weapons is also greatly improved. Manganese steel helmet can no longer meet the new protection requirements, and the development of helmet is facing new challenges. In the 1970s, American companies developed a collar for individual soldiers, which made a new breakthrough in the development of helmets.

Judging from the materials used in military helmets of major countries in the 20th century, there are mainly the following kinds of helmets: Kevlar helmet, nylon helmet, modified polypropylene helmet, ultra-high molecular polyethylene helmet and steel helmet. The Kevlar helmet of the US Army was first used in the "Grenada" campaign. According to the summary report of 1983, the United States invaded Grenada, a small Caribbean country. A total of 22 7.62mm bullet warheads hit Kevlar helmet, but failed to penetrate. The bulletproof performance of Kevlar helmet was tested in invasion of grenada and Gulf War. In today's world, in addition to the US military, the armies of Japan, Germany, Spain, Italy, Belgium, Singapore and Canada are all equipped with Kevlar helmets. In the 1980s, the French army replaced the new helmet and the 5 1 helmet equipped in 195 1. The new helmet material is manganese steel, which improves the protective performance; In addition to foreign countries, the armies of Russia, Denmark, the Czech Republic, the Netherlands and other countries are also using helmets, but at the same time they are still studying helmets made of synthetic materials, and some national armies have been partially equipped.