This paper aims at probing into the dramatic effects of Channeling and the missions of The Young Soldier’s Ghost in Steven Dietz’s Last of the Boys. This play dramatizes the difficult lives of the bereaved family of the Vietnam War (Lorraine and Salyer) as well as the Vietnam veterans (Ben and Jeeter). Ben’s Channeling with Robert McNamara’s spirit made four times in the play makes it possible to reenact and argue on McNamara’s policies on Vietnam in the 1960s. The Gulf of Tonkin Incidents, the Resolution of Tonkin Gulf, the bombardments of Hanoi and Haiphong, and the escalation of the American military personnel in South Vietnam dealt in the play are some of his policies on Vietnam. In relation to this, The Young Soldier’s Ghost appears on the stage four times, helping Ben assume the costume of his father, inducing McNamara’s spirit to reenact self-justifying statements on his policies, correcting his spirit’s distorted viewpoints on the human nature and the history of mankind through three baptisms by water, and making his spirit apologize to Salyer for her father’s death in the Vietnam War.