Master Sgt. Ricky Matthias, 343rd Training Squadron instructor, briefs Defense Secretary Ash Carter on security forces combatives training at the Security Forces Academy, Joint Base San Antonio-Lackland, Nov. 16, 2016. Carter is on a four-day trip focusing on the readiness of the nation’s force and the effectiveness of the warfighter’s training and equipment. ( Air Force photo by Sean M. Worrell)

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Keywords: defense, secretary