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Impossible staircase

Workers ascend and descend the breezeway staircase structure between the two dormitory buildings under construction, June 23, 2016 at the I.G. Brown Training and Education Center in Louisville, Tenn. Ladders and lifts (six in all) add to the building site's complexity, with the inner courtyard, and further still, the classroom building in the background. The facility will contain approximately 47,000 square feet of additional space on three levels and two levels with ten 20-person and two 100-person classrooms. (U.S. Air National Guard photo by Master Sgt. Mike R. Smith/Released)

Workers ascend and descend the breezeway staircase structure between the two dormitory buildings under construction, June 23, 2016 at the I.G. Brown Training and Education Center in Louisville, Tenn. Ladders and lifts (six in all) add to the building site's complexity, with the inner courtyard, and further still, the classroom building in the background. The facility will contain approximately 47,000 square feet of additional space on three levels and two levels with ten 20-person and two 100-person classrooms. (U.S. Air National Guard photo by Master Sgt. Mike R. Smith/Released)

Workers build forms and pour a concrete sidewalk leading from the billeting office to Spruance Hall (in the background) June 13, 2016, among other interior and exterior projects on the new facility at the I.G. Brown Training and Education Center in Louisville, Tenn. (U.S. Air National Guard photo by Master Sgt. Mike R. Smith/Released)

Workers build forms and pour a concrete sidewalk leading from the billeting office to Spruance Hall (in the background) June 13, 2016, among other interior and exterior projects on the new facility at the I.G. Brown Training and Education Center in Louisville, Tenn. (U.S. Air National Guard photo by Master Sgt. Mike R. Smith/Released)

MCGHEE TYSON AIR NATIONAL GUARD BASE, Tenn. -- In this week's construction photo, workers ascend and descend the breezeway staircase structure between the two dormitory buildings under construction June 23 at the I.G. Brown Training and Education Center in Louisville, Tenn.

Ladders and lifts (six in all) add to the busy building site's complexity, with the inner courtyard, and further still, the classroom building in the background.

Nearby, workers were building forms and pouring a concrete sidewalk leading from Spruance Hall to the billeting office, among other interior and exterior projects pushing the new facility to a projected completion come September.

The facility will contain approximately 47,000 square feet of additional space on three levels and two levels with ten 20-person and two 100-person classrooms.