Tracer ammunition colors per country

[Romanator21]

Japan has .303 that are red in the Ki-27 and in bomber turrets, but yellow on all other fighters. There is a .50 cal which is blue, seen on late war Zeros. Early war .50 cals in Ki-43s and Ki-61s are yellow. 20 mm are yellow, but are blue in the latest Ki-61. 30 mm are yellow.

Allied aircraft have red .303s and .50 cals, and yellow 20mm Hispano.