Ho trovato altro riferimento a questo tipo di insegna di colore giallo:
Headgear
Finally, on the front of the steel helmet (the Japanese helmets, both Army and Navy, being relatively flimsy compared to the US model), where the Japanese Army soldiers sported a small yellow star, and the Navy infantry had an anchor emblem. As with the Army foot soldiers, the Japanese naval infantry frequently wore netting over their helmets, into which bits of the local foliage could be stuck for camouflage purposes.

Japanese Special Naval Landing Forces - Wikipedia, the free encyclopedia

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