Zhengzhou City, the provincial seat of Henan in central China, has finally embraced a sunny day after several consecutive days of rain. On July 23, Chen Bo, the director of the political work department of an air force station assigned to the PLA Air Force stationed in Henan, got up early at 4 a.m. He received an order to carry out road dredging operations on five main roads in the urban area of Zhengzhou City with his 148 comrades.