What personnel does TC 3-22.9 suggest should be involved in training assessments?

The correct choice emphasizes the involvement of leaders at all levels in training assessments, as these individuals bring valuable perspectives and insights based on their experience and understanding of the unit's training needs. Involving leaders across various ranks ensures that the assessments are comprehensive and consider multiple viewpoints, which leads to more effective training programs that are tailored to the specific needs of the personnel.

Leaders from different levels are familiar with the strengths and weaknesses of their teams. Their input helps identify areas that require improvement and acknowledges successful training practices that could be expanded upon. Additionally, engaging a wide array of leaders fosters a culture of collaboration and communication, which is crucial for successful training assessments.

In contrast, the options reflecting only the highest-ranking officers, external consultants, or local community volunteers would likely lack the broad and relevant insight that leaders at all levels can provide. Those alternatives could potentially overlook critical nuances specific to the unit and its personnel, which might lead to less effective training outcomes.