First correct answer gets best answer?

Question

decode the following sentence:

(Seniram SU) If repmes

*****Hint: Has to do with "faithful protection"

Answer 1

You have written Semper Fi (US marines) backwards.

Semper Fi is short for Semper Fidelis which is Latin foir 'Always Faithful' The US Marine Corp adopted this saying as their motto

Answer 2

It's backwards. Semper Fi -- always faithful. The Latin is actually Semper Fidelis.

US marines is the part in brackets -- it's the motto of the marines, I guess.

*edits to add wiki link*