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Steps and more steps

A construction worker descends nearly 50 ladder and wood platform steps from the roof of Alexander Hall May 27, 2016, at the I.G. Brown Training and Education Center on McGhee Tyson Air National Guard Base in Louisville, Tenn. The training center is upgrading its gravel roofing with a new tar underlayment and an outer barrier of white pea gravel. (U.S. Air National Guard photo by Master Sgt. Mike R. Smith/Released)

A construction worker descends nearly 50 ladder and wood platform steps from the roof of Alexander Hall May 27, 2016, at the I.G. Brown Training and Education Center on McGhee Tyson Air National Guard Base in Louisville, Tenn. The training center is upgrading its gravel roofing with a new tar underlayment and an outer barrier of white pea gravel. (U.S. Air National Guard photo by Master Sgt. Mike R. Smith/Released)

MCGHEE TYSON AIR NATIONAL GUARD BASE, Tenn. -- A construction worker descends nearly 50 ladder and wood platform steps from the roof of Alexander Hall May 27, 2016, at the I.G. Brown Training and Education Center on McGhee Tyson Air National Guard Base in Louisville, Tenn. The training center is upgrading its gravel roofing with a new tar underlayment and an outer barrier of white pea gravel. (U.S. Air National Guard photo by Master Sgt. Mike R. Smith/Released)