Why do Japanese soldiers have two pieces of cloth hanging on both sides of their hats in the movie? What is it for?

It is used to cover the sun. This kind of military cap was first used by the French North African Corps. It is very effective in preventing sun burns on the back of the neck in desert areas.

There is also a saying that it is anti-mosquito. Fly bites

A strange saying is that those with fly curtains are field troops, and those without fly curtains are military police

Japan created the modern army and navy, which were based on Western France, Britain and other countries. It is modeled after the traditional Chinese style and has obvious inheritance in terms of system and clothing. Among them, the uniforms of the army are similar to those of France in the 1860s. The conical field hats were called carrots by the people of Guangdong during the war of aggression against China. French African colonial garrison hats have a circle of cloth behind them.

However, Japan also innovated when introducing it, and changed it to two pieces of cloth, which were regarded as amulets given by the emperor to each soldier. The general idea: one piece represents the eight macros and one universe, and the other represents the four seas and one body.

The US military also used it during the Gulf War.

Considering the bay environment, the sun protection theory is more credible.