I read this years ago and thoroughly enjoyed it --- saw the movie the other day (they're really cut a lot out of it) hauled the book back out, read it again and it was just enjoyable now as it was then!
Howard Singer must have been or known a schnook. The story even if it seems surrealistic is too real.
Russ is a schnook. Therefore if something can go wrong it will. His wife is into insurance of all kinds. She wants him to get his GI insurance while he can. After she forces him to apply (schnook), he must explain that he has two serial numbers (schnook). When he was shot down over Germany he was presumed dead and needed a second number to get discharged (schnook). So naturally realizing that the (schnook) being in the service only one-day on the second serial number, is called up to finish his time.
He ends up on an island in the middle of the Sea of Japan. There he has a revelation that saves his sanity and that of 400 other servicemen. A plan, so brilliant that I am not about to tell you what it is or how it is executed.
At one point when he is on the island, he has to relieve himself and gets poison ivy. No one believes him and thinks he was the victim of hanky panky. They all stay clear of him until the doctor explains it.
In the book the plan cured his shnookyness; in the movie, it takes a trial. The cast includes Dick Shawn as the schnook and Ernie Kovacs as his commander and hotshot fighter pilot.
I am still waiting for the DVD.
I can relate to this as I also have two serial numbers.