What does the green pennant mean?

Meritorious service is a reward system and an honorary title. The word "green banner" originated from the official reward system in China traditional culture and was widely used in Ming and Qing Dynasties. The word "green banner" is a reward system and honorary title in Qing Dynasty. At that time, the Qing Dynasty awarded red, white, blue and green banners to outstanding generals and civil servants to show their honor. Among them, the green pennant is regarded as the highest honorary title, which will only be awarded when the army wins the battle and makes great achievements.