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There's a Raditzer in every outfit circa 1944: the sniveling, weird little screw-up who can't pull his weight and adds to others' burden. Then there's Charlie Stark: sane, socialized, from a wealthy family. Stark wanted combat duty but was turned down, rejected a commission and ended up drafted onto this troop transport.
It turns out that Charlie Stark's war is as much (internally, emotionally) against the existence of the Raditzer type as against the Axis. It's a war between disgust and compassion. Compassion wins; Stark claims that Raditzer is his friend.
But Raditzer is an awful man, and eventually his lying and bragging get him thrown overboard - by real war-weary folks who have no Starkian ambivalence. Stark hurts from having connected himself (in large measure unconsciously) to badness.
Raditzer arranges for Stark to meet a cafe girl in Hawaii. In such scenes the priveleged naive at-sea Stark is pushed toward obsession and danger.
What's in it for us? Just another war novel written in '60? (Why so many? I've speculated on this previously.)
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Ah, art. It'll bring out your inner Kurtz every time.