By what date must the MAJCOM receive the unit's man-month request?

The correct answer is June 15 because this date aligns with the timeline established for the submission of unit man-month requests within the military structure. The request process is typically scheduled to ensure that all units can accurately assess their manpower needs in advance of the next fiscal year's planning and budget processes. By June 15, Major Commands (MAJCOMs) can compile and process the requests effectively ahead of the deadlines necessary for resource allocation.

Submitting requests by this specific date allows for any necessary approvals, adjustments, or additional evaluations that might be required to finalize personnel planning. June 15 acts as a critical deadline for ensuring that all units' needs are communicated and considered at a broader strategic level, enabling the military to maintain readiness and operational capacity.