Who is Steve Callahan, Rational Self?

Callahan characterizes his psyche as existing in three parts: the rational, the emotional, and the physical. He refers to these parts as his "crew." Early in the tale, before the loss of Napoleon Solo, the triumvirate obeys the rational self, the so-called "captain." As matters worsen, the rational Callahan must aggressively manage the crew, enforcing the discipline necessary to ensure survival. As time passes, the risk of "mutiny" increases.