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>>I think that 'Catch-22' was more from the Korean conflict era.
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>FWIW Catch 22 took place in WWII (Italy)
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>MASH was set in Korea

I don't remember the movie but I remember the scene where a couple of guys (GI's) are sitting on the floor of a C-47, and one of then says, "I'm not doing anything. I'm FIGMO." Those were his only lines.

When I was in the service (USAF) we had guys that would actually put nametags on their unifors that read "SHORT" and "FIGMO" and my favorite, "OMGIF". That FIGMO backwards indicating that you got a worse assignment than the current one, as in "Oh My God, I'm F***ed!"