Analysis of information sources in references of the Wikipedia article "Comrade" in English language version.
According to regulations, members of the PLA address each other: (1) by their duty position, or (2) by their position plus surname, or (3) by their position plus the title "comrade" (tongzhi). When the duty position of the other person is not known, one service member may address the other by military rank plus the word "comrade" or only as comrade.