Who is the leader of the Army's Training and Doctrine Command in this passage?

The leader of the Army's Training and Doctrine Command, as of the specified time, is typically a high-ranking officer responsible for overseeing training programs, doctrine development, and the integration of new operational concepts into military practices. The correct choice in the context given is the individual who is currently serving in that command position.

In this case, Daniel T. Hendrex is recognized for his role in that capacity. Commanding such a pivotal branch of the Army requires extensive knowledge and a track record of leadership within military education and training initiatives, aligning with the responsibilities of the position.

Understanding the roles of other individuals listed is also essential. They may hold notable ranks or influence within the Army, but their positions do not relate directly to the command of Training and Doctrine Command at the specified time. Thus, identifying the correct leader requires awareness of both current leadership and the structure within the Army, highlighting the importance of staying informed about military hierarchy and personnel assignments.