Share April 21, 2020—The clerics have been sworn to secrecy. On this warm morning, they’ve come to a vast and empty parking lot, instructed not to tell anyone of its location. The pitch of asphalt is unusually secure, hidden behind a 12-foot chain-link fence that’s been swathed in sheets of black tarp to prevent anyone from peering through. At the front gate, armed soldiers stand guard. Inside, large trailers are arranged behind tented canopies and banks of lights. Metal ramps are affixed to each trailer so that stretchers can be wheeled in. The interior walls of the trailers are lined...