Final answer:
The 6th Component of The Union's Military Plan likely relates to organizing, arming, and disciplining the militia in line with constitutional mandates and historical practices during the Civil War and Reconstruction Era, although specific details are not provided in the sources.
Step-by-step explanation:
The content of The Union's Military Plan: 6th Component is not entirely clear based on the sources provided, as none explicitly detail a component-based military strategy. However, by analyzing the context of the resources and historical accounts, we might infer that it has to do with the organization, arming, and disciplining of the militia, as per the clauses in the United States Constitution and actions during the Civil War era. To provide more direction, it might concern advancing military policies, shaping military organization and politics, ensuring the readiness of the militia, or executing specific military action such as repelling invasions, as suggested by traditional concepts of military security.
For instance, the Militia clauses from the U.S. Constitution highlight the responsibilities of Congress regarding the militia, including organizing, arming, and disciplining, which is foundational to American military history, especially during reconstruction periods like the one post-Civil War referenced in the '49 Addendum of July 1867'. These clauses were critical for the management and structure of military forces utilized by the Union.