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With New York hospitals overwhelmed by covid-19, the Jacob K. Javits Center is being converted by the Army Corps of Engineers into a 3,000-bed medical facility. (Video: Skyler Reid/The Washington Post)

NEW YORK — Soldiers in camouflage and civilians in polo shirts lined up for a life-or-death battle: Keeping a potentially deadly virus from overrunning this makeshift hospital inside a 2.1-million-square-foot convention center within the densest, most populous city in America.

Colored tape on the floor marked where to stand. Six feet. Six feet. Six feet. Proceed to the neon yellow box. Answer the soldier’s questions.