How are stereotypes enacted in Walter Mitty's dreams?

The most overt stereotype is that of the confident hero. The first daydream portrays Walter as the commanding officer on an airplane. He and the crew are actually flying into a hurricane. Walter, as commander, orders them to fly through it. His subordinates have complete confidence despite the insanity of trying to fly through a hurricane. This is a cliche of a confident, flawless leader. Walter's dreams are full of stereotypes and cliches. In order...

The most overt stereotype is that of the confident hero. The first daydream portrays Walter as the commanding officer on an airplane. He and the crew are actually flying into a hurricane. Walter, as commander, orders them to fly through it. His subordinates have complete confidence despite the insanity of trying to fly through a hurricane. This is a cliche of a confident, flawless leader. Walter's dreams are full of stereotypes and cliches. In order to escape the dullness of his daily life, he tries to fill his dreams with hyperbolic and dramatic scenarios where he is the hero. Everything is exaggerated so that he can imagine himself in the most stereotypical and simplistic ways. In other words, in his daily life, things are complicated and he is inept. In his dreams, he wants things to be simple and heroic. Stereotypes communicate with generalized characters and simplicity. 

In another daydream, he is an impossibly resourceful and renowned surgeon. When the anesthetizer stops working (and there is no one in the "East" who knows how to fix it), Dr. Mitty fixes it magically with a pen. Like many of his heroic personas of his dreams, Mitty is impossibly good, too good to be true. 

In another daydream, Walter is a captain who fits the stereotype of the rugged, hard-drinking, absolutely confident leader and soldier. He gulps down some brandy before heading into an impossible mission and his sergeant says he's never known anyone who could hold his liquor like Walter. Walter is so confident that he gives a nonchalant "Cheerio" to the sergeant as he departs for the mission. 

The stereotypical confident man is a prominent theme in his dreams. In the end, facing apparent certain death, Mitty is calm and collected.