Air Force Chief Master Sgt. Alexander Del Valle, 51st Fighter Wing command chief, thanks Dave Roever, a Vietnam War veteran, for speaking about resiliency at Osan Air Base, Republic of Korea, Jan. 25, 2017. Roever, is an inspirational speaker who shares his story about how he survived after suffering burns all over his body when a phosphorus grenade exploded in his hand during the war. ( Air Force photo by Staff Sgt. Jonathan Steffen)

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Keywords: air, force, usaf