Fact-Checking Semper Fi: Origins, True Definition, and Common Misconceptions

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The Marine Corps did not march under Semper Fidelis during the American Revolutionary War or the War of 1812. During its earliest campaigns, the Corps relied on several unofficial slogans. Marines fighting in the War of 1812 often adopted Fortitudine (With Fortitude). Antebellum units occasionally favored "By Sea and by Land," an English adaptation of the British Royal Marines motto Per Mare, Per Terram. Other early units invoked "To the Shores of Tripoli," commemorating the 1805 battle of Derna.

This fragmented heraldry ended in 1883. Colonel Charles McCawley, the 8th Commandant of the Marine Corps, recognized the need for a unified institutional identity as the service transformed into a modern expeditionary force. McCawley officially decreed Semper Fidelis as the sole, official motto of the United States Marine Corps. Five years later, in 1888, legendary composer and former director of the U.S. Marine Band John Philip Sousa composed the stirring march "Semper Fidelis," cementing the cadence into the national consciousness.