Which historical military insignia design element has generated the highest retail merchandise sales in the civilian market over the past decade?

Throughout military history, insignias and logos have played a crucial role in unit identification, morale, and esprit de corps. These powerful symbols have evolved into some of the most recognizable brand elements in military merchandising today. Test your knowledge about how military insignia design principles have influenced modern military product branding and retail strategies. Can you identify which famous military logo design element has been most successfully leveraged in commercial merchandising?

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The U.S. Marine Corps' Eagle, Globe, and Anchor emblem
The U.S. Army's Black Knights (West Point) logo
The Royal Air Force's roundel design
The Navy SEAL trident insignia