Eventually, the prime suspect in the case turns out (incorrectly) to be Chaplain Tappman as Yossarian once, during his initial censorship campaign, forged the Chaplain's name following the words, "I yearn for you tragically" on a letter from which he had already censored all text except for the letter's opening: "Dear Mary,".
In Joseph Heller's book Catch-22, the Chaplain, having been told to examine a forged letter allegedly signed by him (which he knew he didn't sign), verified that his name was in fact there.
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