Pressure relief
MCGHEE TYSON AIR NATIONAL GUARD BASE, Tenn. - Master Sgt. Don Pierson laughs as he checks the tire pressure on a government van here May 10, 2016, while managing his morning duties at the I.G. Brown Training and Education Center. Pierson is preparing for a reassignment after more than 10 years' service on campus. (U.S. Air National Guard photo by Master Sgt. Mike R. Smith/Released)

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