The next day, it was a sunny day, but the sky was still thin and loose with some dark clouds. Early in the morning, more than 400 freshmen gathered on the school playground, waiting for the arrival of the Air Force 99842 Force instructors.

Air Force 99842 is an Air Force unit stationed in L city. It is a checkpoint of the South Gate of the country and shoulders the heavy responsibility of defending the air field of the south of the country.

The freshmen of ten classes in Senior High School stood on the school playground, dressed in military training clothes, and the warm ocean sunshine in the morning...