Two Steps From Hell (Uncommon Valor) Posted on August 23, 2020 by Jake Sully 11 “Semper Fidelis” (“Always Faithful”) is the motto of the Corps. That Marines have lived up to this motto is proved by the fact that there has never been a mutiny, or even the thought of one, among U.S. Marines. CONCLUSION Semper Fidelis was adopted about 1883 as the motto of the Corps. What do you think of this post?Awesome (0)Interesting (0)Useful (0)Boring (0)Sucks (0)