"Semper Fi" is short for Semper Fidelis, a Latin phrase that means "Always Faithful." It has been the official motto of the U.S. Marine Corps since 1883.
More than just a slogan, Semper Fi represents the loyalty and commitment Marines have to their country and their mission. It reflects their dedication to staying true to their values. Over time, it has become a symbol of the strong bond shared among Marines, both during and after their service.
What Does ‘Semper Fi’ Mean?
The "Semper" in "Semper Fi" means "always."
"Fi," short for "Fidelis," stands for the word "faithful." This root is familiar to English speakers because it's the same root in words such as "fidelity," "confide" and "confidant" -- all of which carry connotations of trust and stability.
In everyday use, Marines often say "Semper Fi" as a greeting, a farewell or a way to show camaraderie. Using the phrase is seen as a sign of respect and solidarity, whether on the battlefield or even years after their service.
The "Semper Fi" pronunciation rhymes with "temper high."
Historical Origin of ‘Semper Fidelis’
According to the U.S. Marine Corps' History Division, before Semper Fidelis became the official motto of the Marine Corps in 1883, the Corps went through a few different mottoes -- none of them official.
The earliest known motto, dating back to before the War of 1812, was "Fortitudine" -- Latin for "With Fortitude." Later, the Marines adopted "By Sea and by Land," which was a direct translation of the British Royal Marines' motto, "Per Mare, Per Terram."
Semper Fi Always Faithful
Then, in 1805, after Lt. Presley O'Bannon led Marines in capturing the city of Derna during the First Barbary War, the motto changed to "To the Shores of Tripoli" to honor that victory. In 1848, following the Marine Corps' role in capturing Mexico City, the phrase was expanded to "From the Halls of Montezuma to the Shores of Tripoli." That line, of course, later became the opening lyrics of The Marines' Hymn.
The phrase "Semper Fidelis" isn't unique to the Marine Corps. Variations have been found in old Latin manuscripts and religious writings, often referring to faithfulness to God.
Col. Charles G. McCawley, who was the commandant of the Marine Corps in 1883, may have been the one who chose "Semper Fidelis" as the service's new motto, but this isn't verified as McCawley kept little documentation, according to the National Museum of the Marine Corps.
Read More: Marine Corps History: The Early Years
‘Semper Fi’ and the United States Marine Corps
The Marine Corps is built on three core values: honor, courage and commitment. These principles are meant to shape every Marine's character and actions.
- Honor: Marines are held to the highest ethical standards. They are expected to show integrity and respect in all they do. "Semper Fi" represents being faithful to this value.
- Courage: Whether in battle or in life, Marines face challenges head-on. The motto is a reminder to stay strong, no matter the circumstances.
- Commitment: Loyalty to fellow Marines, the mission and the nation is at the heart of the Corps. "Semper Fi" signifies that this dedication never fades.
In combat, "Semper Fi" is more than a phrase. It becomes a mindset. Because Marines rely on each other so heavily, the motto serves as a reminder of their unbreakable bond.
In ceremonies and traditions, everything from boot-camp graduations to retirement ceremonies, "Semper Fi" is spoken as a symbol of pride and loyalty.
This doesn't mean "Semper Fi" is used only in formal settings or times of crisis, however. It can be an everyday greeting or farewell. When one Marine says "Semper Fi" to another, it's a recognition of shared hardships, victories and a connection that transcends time.
Read More: Marine Corps Birthday
Cultural and Emotional Significance
Beyond its meaning of "Always Faithful," "Semper Fi" can be a deeply personal and emotional bond that ties Marines together for life.
Marines are trained to push through challenges, endure hardships and keep going, no matter what. Semper Fi serves as a reminder of this resilience, inspiring them to stay strong even in the most difficult situations. It's a rallying cry that fuels determination in the toughest moments.
For most Marines, the phrase represents a commitment that doesn't end when service does. It embodies the idea that no Marine is ever truly alone.
The phrase is found on Marine Corps merchandise, unit logos, license plates, T-shirts and caps, decals and tattoos. Some Marine-owned businesses use "Semper Fi" in their names, such as Semper Fi & America's Fund (a veterans support organization) and Semper Fi Heating & Cooling. It's taped up in hospital rooms of Marines recovering from surgery to lift their spirits. It's often spoken at funerals and memorials and included in obituaries.
Read More: The Military Has a Vocabulary All its Own. Here are Some Common Terms and Phrases
"Semper Fi" has also very much made its way into popular culture and entertainment. There are even at least a couple of movies with the phrase in the title, including "Semper Fi" (2019) and "Semper Fi: Always Faithful" (2011).
Is it OK to Say 'Semper Fi'?
Yes, it's OK to say "Semper Fi," but context matters. Because the phrase is so deeply meaningful to Marines, it's best to use it only when speaking to a Marine in a respectful way, such as thanking them for their service.
It's also appropriate to say it when quoting or referencing Marine culture, or in a formal or historical discussion. However, if you are not a Marine, using it casually or as a personal motto might seem inappropriate. It can also come off as disrespectful if used jokingly or in a way that diminishes its significance.
If you're unsure, a simple "thank you for your service" is always a safe and appreciated way to show respect.
What Do Marines Say in Response to Semper Fi?
When a Marine says "Semper Fi," the most common responses are:
- "Oorah!": a spirited battle cry used to express enthusiasm, motivation or acknowledgment.
- "Semper Fi, Marine!": A direct acknowledgment, reinforcing loyalty.
- "Semper Fi, do or die!": A more traditional and enthusiastic response sometimes used in chants or informal settings.
Misconceptions About ‘Semper Fi’
"Semper Fi" is a phrase that belongs to the U.S. Marine Corps, but sometimes people use it incorrectly. Since it means "Always Faithful," some think it applies to the military in general, but it's only for the Marines. You might hear it in movies, on social media or from people who aren't Marines trying to show patriotism. However, to actual Marines and veterans, using it the wrong way can feel disrespectful.
Another source of confusion is that other branches of the military have their own mottos that are similar in some cases. The Coast Guard says "Semper Paratus," which means "Always Ready" (and was considered at one point for the Marine Corps motto). The Space Force uses "Semper Supra," or "Always Above." These represent the values of each branch, just like "Semper Fi" stands for the loyalty and camaraderie of the Marines.
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