Answer: fidelis

AnswerCrossword Clue
FIDELIS"Semper ..." (Marine's motto)
FIDELISFaithful to Caesar?
FIDELISPart of the Leathernecks' motto.
FIDELIS"Semper ...," Marine Corps motto
FIDELIS"Semper ....." (Marine Corps motto)
FIDELISAdjective in the Marine motto