Why is the sentry on guard like a wooden head?
The situation of setting up sentries in front of important organs and units comes from the war years. At that time, troops were fighting outside, and important military organs (such as headquarters, headquarters, etc.). For etiquette reasons, the gatepost is erected outside, reflecting the level and importance of the gatepost unit, and so on. No one would expect two guards on duty to resist the enemy's sneak attack and destruction. Similarly, the main purpose of stationing important organs and units in the past was not only to reflect the level and importance of the units, but also to psychologically deter enemy agents, gang members and idlers. To prevent them from carrying out sabotage activities will have a great psychological shock to the bad forces and give the people nearby a great sense of psychological security. This is simply a situation.