Semper Fidelis by John Philip Sousa Song Info
'Semper Fidelis', being Latin for 'Faithful Always', and a rousing song by Sousa, became the motto of the US Marines in 1883. This Sousa tune was written in 1889 first to become a replacement for "Hail To the Chief" but was rejected. It remains their proud code and motto to this day. Which, incidentally, they live up to.