Staff Sgt. Bert Mantilla, 30th Security Forces Squadron conservation patrolman, brushes Military Working Horse "Trooper" before their ride 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 areas on Vandenberg with his patrolman. (U.S. Air Force photo by Airman 1st Class Hanah Abercrombie)