Semper fidelis
（重定向自Semper Fi）
Semper fidelis is a Latin phrase that means "always faithful" or "always loyal". In the United States it is best known as the motto of the United States Marine Corps. Elsewhere, it is a common motto for towns, families, schools, and military units.
The earliest definitively recorded use of semper fidelis is as the motto of the French town of Abbeville since 1369. It has also been used by other towns, and is recorded as the motto of various European families since the 16th century, and possibly since the 13th century or earlier. Records show many families in England, France and Ireland using this motto.