August 15 was the aerial defense alarm sirens testing day for Yantai City, Shandong Province. On that day, over ten thousand servicemen and people participated in a comprehensive aerial defense exercise under the organization and command of the Yantai Garrison and the Civil Air Defense Office of Yantai City. The picture shows a scene of the aerial defense exercise on that day.

　　By He Mingxiang

　　(Aug 28, PLA Daily)