I think that is regular police.
Police were under administration of Min. Interior whereas MPs were under administration of the Army.
http://townweb.e-okayamacity.jp/tats...a/isihara.html
You can see a pic of police uniform here
It might also be Keibodan (neighborhood watch-cum-fire-brigade-cum-air-raid-rescue) but I think those may have the metal rising sun cockade instead of the cloth.
Similar Threads
Bookmarks