How does Jack Ryan grow up?

I think it is possible that this question is meant to ask how Jack Ryan changes over the course of the novel.  A character that displays change is called a dynamic character.  Despite the fact that Jack Ryan is featured in many books, Clancy is still able to make Ryan a dynamic character in The Hunt for Red October. When readers first meet Ryan, he is a quiet and intelligent analyst.  He isn't portrayed as hero material.  He's afraid of flying and quite content to sit behind a desk and analyze intelligence reports.  However, as the novel progresses, readers see Ryan become cooler under pressure.  He is willing to take risks that often put his own life on the line.  In other words, Ryan displays courage and bravery worthy of heroes.  The final line of the novel nicely shows readers that Ryan has at least in some way changed because of the events of the novel.  

Ryan missed the dawn. He boarded a TWA 747 that left Dulles on time, at 7:05 A.M. The sky was overcast, and when the aircraft burst through the cloud layer into sunlight, Ryan did something he had never done before. For the first time in his life, Jack Ryan fell asleep on an airplane.