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With each new switch of the national threat level from “elevated” to “high,” the effect on the District’s landscape is less and less obvious. At 16th and Q Streets NW, however, the D.C. Jewish Community Center is still taking homeland security visibly to heart. During the past few months, orange plastic crash barriers have appeared and disappeared around the building, apparently coming and going with the fluctuating terror risks. Last week, when the threat level went back up to Code Orange, the barriers reappeared. DCJCC Executive Director Arna Meyer Mickelson says only, “We take security very seriously. Beyond that, we don’t comment on security measures.” Another DCJCC employee, who asks not to be named, says the barriers aren’t directly linked to the Code Orange announcement. “We have our own internal security assessment,” he says. —Sarah Godfrey