Which famous military branding transformation occurred in 1939-1940 when a nation completely redesigned its military insignia to avoid confusion with an enemy power?

Throughout military history, visual identification and branding have played crucial roles in battlefield recognition, morale, and intimidation. From ancient standards and flags to modern military logos, the evolution of military branding reflects both tactical necessity and psychological warfare. This trivia question explores how one famous military brand underwent significant transformation during a critical historical period, changing how military forces marketed themselves to both allies and enemies.

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The U.S. Army Air Forces changed their roundel from a blue circle with white star to add red borders after confusion with Japanese aircraft markings
The British Royal Navy abandoned its white ensign in favor of the Union Jack to distinguish ships from French vessels
The Soviet Red Army replaced its red star with a hammer and sickle design to differentiate from German markings
The German Luftwaffe changed from the Iron Cross to the Balkenkreuz to avoid confusion with British aircraft roundels