He was responsible for guiding the military personnel responsible for bombing missions. However, he grew tired of the work and decided to quit. He had to think of a way out since the military regulations required that a military person have to provide enough information to support why he needs to quit. Yossarian decided to act like an insane person so that he would be sent to the hospital. Since insane people could not be fit to work as military personnel, he thought that it would be a great exit plan. Catch 22 has some very challenging clauses that force the military personnel from doing what they would want to do. In this case, Catch 22 forced Yossarian to act like a mad person in order to avoid being military personnel. However, he is given different kind of work of reading and censoring letters from military patients. It is very challenging for Yossarian to prove to the military that he is actually insane. This is because the word insane can mean different things to different people. For example, being insane in the military context is different from being insane in the real civilian world. It can even be said that insanity in military is acceptable especially because of the way the military laws and regulations define it. However, the military law called catch 22 could not allow him to quit the military job since by knowing that he is insane was a proof that he was actually sane. Therefore, Yossarian decided to spend the rest of his life in the hospital.