Si Robertson, Duck Dynasty star, autographs copies of his book “Si-cology 1: Tales and Wisdom from Duck Dynasty's Favorite Uncle” during his book signing at the Exchange Nov. 12, 2013, at Nellis Air Force Base, Nev. Robertson, often referred to as Uncle Si, is a television personality, preacher, hunter, outdoorsman and employee at duck call maker Duck Commander. (U.S. Air Force photo by Senior Airman Matthew Lancaster)
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