These badges /patches/ were introduced on January 25, 1944 by Ministry of Health and Welfare Notice No. 7 in three grades.
Badges were awarded to students who have passed the martial arts exam.
Original official description of the badges.
1944 martialartsbadge
1944 martialartsphysicalfitnessbadge
japanese badge
japanese home front martialartsbadge
japanese homefronet martialartsbadges
japanese physicalfitnessbadgemartialartsphysicalfitnessbadge
上級武道章
中級武道章
初級武道章
武道章