Which statement is true about Captain Robert Mullen in Marine Corps history?

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Understanding how the Marine Corps built its recruiting capacity helps explain why this statement is considered true. Captain Robert Mullen is presented as the first official Marine Corps recruiter, a role that marks the move from informal, word-of-mouth enlistment to a structured, centralized recruiting effort. Taking on that position, he would have established formal recruiting procedures, set up recruiting offices, and led outreach to communities, schools, and bases. That foundational work created a scalable model others could follow, enabling the Corps to grow more consistently and efficiently.

As for the other options, they don’t fit historical records in this context: being a location is not a person, so that choice doesn’t apply; the 13th Commandant was a different individual; and the motto Semper Fidelis was adopted as a Marine Corps slogan through collective tradition rather than being coined by a single recruiter.