Texas State Guard Cpl. Wes Willoughby prepares a blood glucose meter during Operation Lone Star in San Juan, Texas, July 29, 2015. OLS is a five-day mass casualty, emergency preparedness exercise in South Texas, which gives Texas Guardsmen and local and state health agencies the opportunity to treat civilian patients and remain ready for a real-world catastrophe. (Texas National Guard photo by Army Sgt. Praxedis Piñeda) 150729-Z-UK716-010 by Texas Military Department

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