Which of these famous military logos or insignias has been in continuous use for the longest period of time?

Test your knowledge of famous military logos and insignias that have become iconic symbols throughout history. These emblems often represent the values, traditions, and missions of various military branches and units. Some have evolved to become recognizable brand elements in their own right, with significant cultural impact beyond their military origins. Can you identify which famous logo has the oldest continuous use?

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The United States Marine Corps Eagle, Globe, and Anchor (adopted 1868)
The British Royal Air Force roundel (adopted 1915)
The United States Army's 'Big Red One' 1st Infantry Division insignia (adopted 1918)
The United States Navy anchor emblem (adopted 1798)