Participants in a naval study camp line up and salute on a decommissioned missile frigate at the Qingdao Marine Military Exhibition Hall in Qingdao, Shandong province, on Wednesday. With Army Day, which falls on Friday, approaching, the exhibition hall welcomed students from across China for the camp. They toured patriotic education bases, inspected retired military equipment and listened to heroic stories, learning basic military knowledge and cultivating a strong sense of national defense through red-themed educational programs.