07 is a navy armband, a navy costume, representing the rank. It was just a yellow ribbon when it was sent. You can sew it yourself or ask a tailor. One thin lieutenant, two thin lieutenants and three thin captains. A slightly wider major, two lieutenant colonel, three colonels and four senior colonel, the width is 1.5 times that of junior officers. A wide holiday, the slightly wider major general, one wider plus two slightly wider major generals and three generals, the width is 1.5 times that of the school official. There are five stars on the other armband. The third-level officers are the same size, but the pattern is different.