Colonel Cathcart has a long list that has specific instructions for the prayers the chaplain gives, why is that ironic based on chapter 19?

All the Colonel really wants is to reach the goal of a general. Eventually, Colonel Cathcart becomes so desperate to be a general that he decides to utilize religious practices to fulfill his goal. He invites the chaplain to his offices and hands him a copy of The Saturday Evening Post showing an American squadron praying before each mission. The chaplain is relieved that Colonel Cathcart is not going to yell at him again.