There are no specific rules. It basically depends on the personal thoughts of several officers when the army was established. Each army has its own veteran figures, such as the US Navy SEALs. At that time, they hoped to There is a name that covers their capabilities, so Seal, sea air land, sea, air and land is used. On the other hand, it also represents the characteristics of the SEALs as an amphibious force. Another special forces unit in the United States, Delta, and the people who established the unit, were trapped in a delta during the Vietnam War, and finally escaped after being surrounded by several times the number of enemies. They were particularly impressed by this delta, so they established it. The name "Delta" was also used during the army, which was considered to be a reflection of his own experience. Israel's Desert Wild Boy. Wild Boy in Hebrew refers to a strong and brave person who is used for adventure. This is not a bad name. The ones from China are generally the Southern Sword, Siberian Tiger, Falcon, Snow Leopard, Sirius, Flying Dragon, etc. . This name is relatively simple and has no specific meaning. It’s all about expressing bravery