EWPOElectronic Warfare Proponent Office (US Army)
EWPOEast Wicker Park Organization (Chicago, IL)
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References in periodicals archive ?
Then I finally did find them, in "The Facts on File Encyclopedia of Word and Phrase Origins," by Robert Hendrickson (Revised Edition, 1997, Facts on File Inc.: New York (EWPO); my paperback book club edition is called QPB EWPO).
EWPO and presumably the cited authors spell the yes word "UH-HUH".