Tech. Sgt. Markus Mindoro, 99th Ground Combat Training Squadron integrated base defense course flight chief, jokes with students attending the last 99th GCTS Base Security Operations course at the Silver Flag Alpha Range Complex north of Las Vegas Dec. 17, 2014. The 99th GCTS is set to close in early 2015, and all Air Force tactical security forces-based training will be moved to the new Desert Defender Ground Combat Readiness Training Center at Fort Bliss, Texas. ( Air Force photo by Tech. Sgt. Nadine Barclay/Released)

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Keywords: 99, air, airforce, base, bso, creech, force, gcts, military, nellis, operations, security, states, united, usa