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Staff Sgt. Bert Mantilla, 30th Security Forces Squadron conservation patrolman, rides Military Working Horse "Trooper" Feb. 21, 2019, at Vandenberg Air Force Base, Calif. Trooper is a 14 year old American quarter horse who entered active duty in 2010 and helps to patrol 99,600 acres of hard-to-reach Vandenberg with his patrolman. (U.S. Air Force photo by Airman 1st Class Hanah Abercrombie)
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