Prompt and DeviantArt link for the 30th.
No one knows for sure when it happened. Sometime between when it was written in the 20th century and when the USSC’s officer training program was created in the late 21st century, the book Catch 22 was adopted as the formal officer training manual.
Since that time, some NCOs and senior NCOs have expressed their suspicion that Catch 22 was included in classroom literature either by an NCO as a joke or by an officer as a how-not-to manual. However, the current caliber of decision made by USSC senior officers demonstrates that whatever the intent, it has since become viewed as a hot-to instead.