Which document contains the policies that govern Marine Corps recruiting?

The correct choice is the MCO 1100.73, Marine Corps Recruiting Manual. This document is specifically designated to outline the policies, procedures, and guidelines that govern all aspects of recruiting within the Marine Corps. It serves as a comprehensive resource for recruiters, detailing the responsibilities and standards expected in the recruitment process.

Understanding this manual is crucial for anyone involved in recruiting, as it ensures adherence to established protocols and helps maintain the integrity of the recruiting process. The other options, while they may contain important information regarding training, operations, or leadership, do not focus specifically on the recruiting policies, which is why the recruiting manual is the authoritative source in this context.