What is the motto of the United States Marine Corps?

The motto of the United States Marine Corps is "Semper Fidelis," which translates to "Always Faithful" in Latin. This motto reflects the loyalty and commitment that Marines have to their country, their Corps, and each other. It embodies the principles of duty, honor, and a steadfast dedication to service, which are essential to the identity and ethos of the Marine Corps.

The other phrases listed represent different meanings and are associated with various contexts or organizations. For instance, "Fortis et Fideles" means "Brave and Faithful," which, while supportive of a military context, does not hold the same specific significance for the Marine Corps. "Ad Astra Per Aspera," meaning "To the Stars Through Difficulties," is more associated with the state motto of Kansas. "Audere Est Facere," translating to "To Dare is to Do," is known as the motto of certain groups or institutions, but again, it does not capture the unique identity of the Marines as "Semper Fidelis" does. Therefore, "Semper Fidelis" is recognized as the foundational motto that unifies the Marines and encapsulates their core values.