Final answer:
The NCO Historical Legacy embodies the moral and professional principles of the Army, as NCOs are expected to lead by example, mentor soldiers, and uphold the Army's core values.
Step-by-step explanation:
The historical Noncommissioned Officers (NCOs) embody the moral and professional principles of the Army through their historical legacy. This is best represented by option B) NCO Historical Legacy. NCOs have traditionally served as the backbone of the army, setting examples for soldiers by upholding high ethical standards and demonstrating professionalism. This legacy includes the expectations for NCOs to lead by example, mentor soldiers, and ensure the welfare of their subordinates while also embodying the Army's core values.