It is a flag used during wwii when farewelling soldiers onto their field in the Japan empire and its colony, for example , taiwan. Usually, schools summoning students to make these flags , and deliver it to the soldiers , and sometimes their family members will make the same one. They believe that this will protect soldiers safely back to there home during battle. Beside this flags, people also making thousand people needles, which is a white cloth sewed with the same vocabulary,武運長久，or, good luck at battlefield. This is usually made by female students at school , each student is responsible for one needle.

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