DISCLOSURE: I read Catch-22 for the second time just last week.
The idea of desertion popped into my mind from reading Catch-22, and it got me wondering. How would a guardsman desert from PDF or Imperial Guard service on a Hive Planet being riddled with Chaos Cultists? How would you desert if you were a guardsman on that Hive Planet?
There are going to be factors in behavior, of course. Level of indoctrination, origin world, and availability of good officers. (military and political) But assuming that a Guardsman or PDF Trooper is determined to escape from his regiment and their control…how would he/she? I have a handful of ideas, but I would appreciate a few other perspectives.