"Swing the arm below" is the password for the commander to command the team members to perform specific actions. In military training, password is an important way of organization, which can quickly and accurately convey the commander's intention and facilitate the coordinated action of the whole team. The password under the swing arm is usually a combined action, including raising hands, swinging arms, letting go and other steps, which requires standardized training to achieve a highly coordinated effect.

The word "swinging arm" first appeared in military publications and is a standard military term. According to historical records, as early as the Ming Dynasty, Lu Zhen, an ancient Chinese military strategist, introduced the password command in ancient Chinese military in detail in his classic military work "General Theory of Wu Jing". This way of command was carried forward by later military strategists and gradually became an indispensable part of modern military. Therefore, the word "swinging arm" has become an important part of China's military culture.

In addition to military training, the following swing arm codes can also be used in other fields. For example, in sports competitions, some events need the cooperation of athletes, and it is also a common method to complete actions through sound guidance. In group tourism activities, it is also an effective organization method to coordinate everyone's speed and pace through the following swing arm password. Therefore, the following swing arm is not only the embodiment of military culture, but also plays a certain role in real life.