Our belonged labor union always ordered us wearing the union's armband on demanding wage up about a month. I had not liked wearing an armband. I remember armbands worn by notorious Kempei in Japan, Nazis in Germany, and Red guard ( 紅衛兵 ) in China.
The press persons of Japan wear the armbands even now as the riot policemen ( 機動隊 ) of Japan did. Japanese modern police likes the word 'kidou' ( 機動 ), internal police ( 特高 ) and Kempei ( 憲兵 ) competed one another. Originally IJN named her air strike fleet kidoubutai ( 機動部隊 ). Asahi Shimbun declares that crews wear armbands.
I appreciate their courtesy extended to uploaded images.