The first is to make the queue neat.

The second is to improve the morale of the troops.

In fact, shouting (1234) is called crying (or slogan sound) in the army, which is one of the three (singing, applause and crying) in the army.

There are usually four ways to shout: one, two, three and four.

One, two, three, four

One, two, three, four.

One, two, three, four