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,".
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Later, Major Major begins signing documents as Washington Irving, having heard about the C.I.D. man trying to catch the man censoring documents and signing them Washington Irving in the hospital.